List of ONE Championship champions

This is a list of ONE Championship champions in each weight division of each sport.

Current champions

Men
Division	Champion	Since	Ref.	Defenses
Mixed martial arts
Heavyweight 265 lb (120.2 kg)	Senegal Oumar Kane	Nov 9, 2024		0
Light Heavyweight 225 lb (102.1 kg)	Russia Anatoly Malykhin	Dec 3, 2022		0
Middleweight 205 lb (93.0 kg)	Mar 1, 2024		0
Welterweight 185 lb (83.9 kg)	United States Christian Lee	Nov 19, 2022		0
Lightweight 170 lb (77.1 kg)	Aug 26, 2022		1
Featherweight 155 lb (70.3 kg)	China Tang Kai	Aug 26, 2022		1
Bantamweight 145 lb (65.8 kg)	Mongolia Enkh-Orgil Baatarkhuu	Dec 6, 2025		0
Flyweight 135 lb (61.2 kg)	Japan Yuya Wakamatsu	Mar 23, 2025		1
Strawweight 125 lb (56.7 kg)	Philippines Joshua Pacio	Mar 1, 2024		1
Kickboxing
Heavyweight Above 225 lb (102.1 kg)	Turkey Samet Agdeve	Nov 8, 2025		0
Light Heavyweight 225 lb (102.1 kg)	Ukraine Roman Kryklia	Nov 16, 2019		2
Lightweight 170 lb (77.1 kg)	Suriname Regian Eersel	Apr 10, 2026		0
Featherweight 155 lb (70.3 kg)	Thailand Superbon Singha Mawynn	Jan 6, 2025		1
Bantamweight 145 lb (65.8 kg)	England Jonathan Haggerty	Nov 4, 2023		1
Flyweight 135 lb (61.2 kg)	Thailand Superlek Kiatmuukao	Jan 14, 2023		2
Strawweight 125 lb (56.7 kg)	Canada Jonathan Di Bella	Oct 4, 2025		0
Muay Thai
Heavyweight Above 225 lb (102.1 kg)	Ukraine Roman Kryklia	Dec 8, 2023		1
Lightweight 170 lb (77.1 kg)	Suriname Regian Eersel	Oct 22, 2022		3
Featherweight 155 lb (70.3 kg)	Thailand Tawanchai P.K.Saenchai	Sep 29, 2022		4
Bantamweight 145 lb (65.8 kg)	Thailand Rambolek Chor.Ajalaboon	Mar 20, 2026		0
Flyweight 135 lb (61.2 kg)	Vacant	Nov 7, 2024		-
Strawweight 125 lb (56.7 kg)	Thailand Prajanchai P.K.Saenchai	Dec 22, 2023		1
Atomweight 115 lb (52.2 kg)	Japan Nadaka Yoshinari	November 16, 2025		0
Submission grappling
Welterweight 185 lb (83.9 kg)	United States Tye Ruotolo	Nov 4, 2023		3
Lightweight 170 lb (77.1 kg)	United States Kade Ruotolo	Oct 22, 2022		3
Flyweight 135 lb (61.2 kg)	Brazil Diogo Reis	Dec 6, 2025		0

Women
Division	Champion	Since	Ref.	Defenses
Mixed martial arts
Atomweight 115 lb (52.2 kg)	Philippines Denice Zamboanga	May 2, 2025		0
Kickboxing
Strawweight 125 lb (56.7 kg)	Austria Stella Hemetsberger	Feb 14, 2026		0
Atomweight 115 lb (52.2 kg)	Thailand Phetjeeja Lukjaoporongtom	Mar 9, 2024		2
Muay Thai
Strawweight 125 lb (56.7 kg)	Austria Stella Hemetsberger	Sep 6, 2025	–	0
Atomweight 115 lb (52.2 kg)	Brazil Allycia Rodrigues	Aug 28, 2020		3

Men's championship history

Heavyweight World Championship

Weight limit — MMA: 265 lb (120.2 kg) — Kickboxing / Muay Thai: Unlimited

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	United States Brandon Vera def. Paul Cheng	ONE: Spirit of Champions Pasay, Philippines	Dec 11, 2015	1982 days	1. def. Hideki Sekine at ONE: Age of Domination on Dec 2, 2016 2. def. Mauro Cerilli at ONE: Conquest of Champions on Nov 23, 2018
2	Canada Arjan Bhullar	ONE: Dangal Kallang, Singapore	May 15, 2021	769 days
—	Russia Anatoly Malykhin def. Kirill Grishenko for interim title	ONE: Bad Blood Kallang, Singapore	Feb 11, 2022	—
3	Russia Anatoly Malykhin	ONE Friday Fights 22 Bangkok, Thailand	Jun 23, 2023	505 days
4	Senegal Oumar Kane	ONE 169 Bangkok, Thailand	Nov 9, 2024	524 days (incumbent)
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Ukraine Roman Kryklia def. Alex Roberts	ONE Fight Night 17 Bangkok, Thailand	Dec 8, 2023	861 days (incumbent)	1. def. Lyndon Knowles at ONE Fight Night 30 on April 5, 2025
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Turkey Samet Agdeve def. Roman Kryklia	ONE Fight Night 37 Bangkok, Thailand	Nov 8, 2025	160 days (incumbent)

Light Heavyweight World Championship

Weight limit: 225 lb (102.1 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Brazil Roger Gracie def. Michal Pasternak	ONE: Ascent to Power Kallang, Singapore	May 6, 2016	526 days
The title was vacated after Roger Gracie announced his retirement from MMA on October 14, 2017.
2	Myanmar Aung La Nsang def. Alexandre Machado	ONE: Quest for Gold Yangon, Myanmar	Feb 23, 2018	1160 days	1. def. Brandon Vera at ONE: Century − Part 2 on Oct 13, 2019
3	Netherlands Reinier de Ridder	ONE on TNT 4 Kallang, Singapore	Apr 28, 2021	584 days
4	Russia Anatoly Malykhin	ONE on Prime Video 5 Pasay, Philippines	Dec 3, 2022	1231 days (incumbent)
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Ukraine Roman Kryklia def. Tarik Khbabez	ONE: Age Of Dragons Beijing, China	Nov 16, 2019	2344 days (incumbent)	1. def. Andrei Stoica at ONE: Collision Course on Dec 18, 2020 2. def. Murat Aygün at ONE: Full Circle on Feb 25, 2022

Middleweight World Championship

Weight limit: 205 lb (93 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Kazakhstan Igor Svirid def. Leandro Ataides	ONE: Battle of the Lions Kallang, Singapore	Nov 7, 2014	336 days
2	Russia Vitaly Bigdash	ONE: Tigers of Asia Kuala Lumpur, Malaysia	Oct 9, 2015	630 days	1. def. Aung La Nsang at ONE: Quest for Power on Jan 14, 2017
3	Myanmar Aung La Nsang	ONE: Light of a Nation Yangon, Myanmar	Jun 30, 2017	1218 days	1. def. Ken Hasegawa at ONE: Spirit of a Warrior on Jun 29, 2018 2. def. Mohammad Karaki at ONE: Pursuit of Greatness on Oct 26, 2018 3. def. Ken Hasegawa at ONE: A New Era on Mar 31, 2019
4	Netherlands Reinier de Ridder	ONE: Inside the Matrix Kallang, Singapore	Oct 30, 2020	1218 days	1. def. Kiamrian Abbasov at ONE: Full Circle on Feb 25, 2022 2. def. Vitaly Bigdash at ONE 159 on Jul 22, 2022
5	Russia Anatoly Malykhin	ONE 166 Lusail, Qatar	Mar 1, 2024	777 days (incumbent)

Welterweight World Championship

Weight limit: 185 lb (83.9 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Japan Nobutatsu Suzuki def. Brock Larson	ONE: War of Nations Kuala Lumpur, Malaysia	Mar 14, 2014	168 days
2	United States Ben Askren	ONE: Reign of Champions Dubai, United Arab Emirates	Aug 29, 2014	1520 days	NC. against Luis Santos at ONE: Valor of Champions on Apr 24, 2015 1. def. Agilan Thani at ONE: Dynasty of Heroes on May 26, 2017 2. def. Zebaztian Kadestam at ONE: Shanghai on Sep 2, 2017 3. def. Shinya Aoki at ONE: Immortal Pursuit on Nov 24, 2017
Askren vacated the title on October 27, 2018 when he was released from his contract.
3	Sweden Zebaztian Kadestam def. Tyler McGuire	ONE: Warrior's Dream Jakarta, Indonesia	Nov 17, 2018	342 days	1. def. Georgiy Kichigin at ONE: Reign of Valor on Mar 8, 2019
4	Kyrgyzstan Kiamrian Abbasov	ONE: Dawn Of Valor Jakarta, Indonesia	Oct 25, 2019	1119 days	1. def. James Nakashima at ONE: Inside the Matrix 2 on Nov 6, 2020
Abbasov was stripped of the title on November 17, 2022, after failing to make weight for his title defense against Christian Lee at ONE on Prime Video 4.
5	United States Christian Lee def. Kiamrian Abbasov	ONE on Prime Video 4 Kallang, Singapore	Nov 19, 2022	1245 days (incumbent)
Submission grappling
No.	Name	Event	Date	Reign	Defenses
1	United States Tye Ruotolo def. Magomed Abdulkadirov	ONE Fight Night 16 Bangkok, Thailand	Nov 4, 2023	895 days (incumbent)	1. def. Izaak Michell at ONE Fight Night 21 on Apr 6, 2024 2. def. Dante Leon at ONE Fight Night 31 on May 3, 2025 3. def. Paweł Jaworski at ONE Fight Night 41 on Mar 14, 2026

Lightweight World Championship

Weight limit: 170 lb (77.1 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	South Korea Kotetsu Boku def. Zorobabel Moreira	ONE: Rise of Kings Kallang, Singapore	Oct 6, 2012	181 days
2	Japan Shinya Aoki	ONE: Kings and Champions Kallang, Singapore	Apr 5, 2013	1316 days	1. def. Kamal Shalorus at ONE: Reign of Champions on Aug 29, 2014 2. def. Koji Ando at ONE: Warrior's Quest on May 22, 2015
3	Philippines Eduard Folayang	ONE: Defending Honor Kallang, Singapore	Nov 11, 2016	364 days	1. def. Ev Ting at ONE: Kings of Destiny on Apr 21, 2017
4	Australia Martin Nguyen	ONE: Legends of the World Pasay, Philippines	Nov 10, 2017	322 days
Nguyen vacated the title on September 28, 2018 due to suffering an injury in training, rendering him unable to defend the title.
5	Philippines Eduard Folayang (2) def. Amir Khan	ONE: Conquest of Champions Pasay, Philippines	Nov 23, 2018	128 days (492 days)
6	Japan Shinya Aoki (2)	ONE: A New Era Tokyo, Japan	Mar 31, 2019	47 days (1410 days)
7	United States Christian Lee	ONE: Enter the Dragon Kallang, Singapore	May 17, 2019	861 days	1. def. Iuri Lapicus at ONE: Inside the Matrix on Oct 30, 2020 2. def. Timofey Nastyukhin at ONE on TNT 2 on Apr 14, 2021
8	South Korea Ok Rae-yoon	ONE: Revolution Kallang, Singapore	Sep 24, 2021	336 days
9	United States Christian Lee (2)	ONE 160 Kallang, Singapore	Aug 26, 2022	1330 days (incumbent)	NC. against Alibeg Rasulov at ONE Fight Night 26 on Dec 7, 2024 1. def. Alibeg Rasulov at ONE 173 on Nov 16, 2025
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Suriname Regian Eersel def. Nieky Holzken	ONE: Enter the Dragon Kallang, Singapore	May 17, 2019	1786 days	1. def. Nieky Holzken at ONE: Dawn Of Valor on Oct 25, 2019 2. def. Mustapha Haida at ONE: Fists Of Fury 3 on Feb 26, 2021 3. def. Islam Murtazaev at ONE: Winter Warriors on Dec 3, 2021 4. def. Arian Sadiković at ONE 156 on Apr 22, 2022
2	France Alexis Nicolas	ONE Fight Night 21 Bangkok, Thailand	April 6, 2024	182 days
3	Suriname Regian Eersel (2)	ONE Fight Night 25 Bangkok, Thailand	Oct 5, 2024	180 days (1966 days)
Eersel was stripped of the title on April 3, 2025, after failing to hydration test for his title defense against Alexis Nicolas at ONE Fight Night 30.
4	Suriname Regian Eersel (3) def. Rungrawee Sitsongpeenong	ONE Friday Fights 150 Bangkok, Thailand	Apr 10, 2026	7 days (incumbent)
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Suriname Regian Eersel def. Sinsamut Klinmee	ONE on Prime Video 3 Kuala Lumpur, Malaysia	Oct 22, 2022	1273 days (incumbent)	1. def. Sinsamut Klinmee at ONE Friday Fights 9 on Mar 17, 2023 2. def. Dmitry Menshikov at ONE Fight Night 11 on June 9, 2023 > 3.def. George Jarvis at ONE Fight Night 34 on Aug 2, 2025
Submission grappling
No.	Name	Event	Date	Reign	Defenses
1	United States Kade Ruotolo def. Uali Kurzhev	ONE on Prime Video 3 Kuala Lumpur, Malaysia	Oct 22, 2022	1273 days (incumbent)	1. def. Matheus Gabriel at ONE on Prime Video 5 on Dec 3, 2022 2. def. Tommy Langaker at ONE Fight Night 11 on June 9, 2023 3. def. Tommy Langaker at ONE 165 on January 28, 2024

Featherweight World Championship

Weight limit: 155 lb (70.3 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Philippines Honorio Banario def. Eric Kelly	ONE: Return of Warriors Kuala Lumpur, Malaysia	Feb 2, 2013	118 days
2	Japan Koji Oishi	ONE FC: Rise to Power Pasay, Philippines	May 31, 2013	455 days	1. def. Honorio Banario at ONE: Moment of Truth on Dec 6, 2013
3	Mongolia Jadamba Narantungalag	ONE: Reign of Champions Dubai, United Arab Emirates	Aug 29, 2014	449 days
—	Russia Marat Gafurov def. Martin Nguyen for interim title	ONE: Odyssey of Champions Jakarta, Indonesia	Sep 27, 2015	—
4	Russia Marat Gafurov	ONE: Dynasty of Champions 3 Beijing, China	Nov 21, 2015	636 days	1. def. Kazunori Yokota at ONE: Kingdom of Champions on May 27, 2016 2. def. Jadamba Narantungalag at ONE: Defending Honor on Nov 11, 2016
5	Australia Martin Nguyen	ONE: Quest for Greatness Kuala Lumpur, Malaysia	Aug 18, 2017	1169 days	1. def. Christian Lee at ONE: Unstoppable Dreams on May 18, 2018. 2. def. Jadamba Narantungalag at ONE: Roots of Honor on Apr 12, 2019 3. def. Koyomi Matsushima at ONE: Dawn of Heroes on Aug 2, 2019
6	United States Thanh Le	ONE: Inside the Matrix Kallang, Singapore	Oct 30, 2020	665 days	1. def. Garry Tonon at ONE: Lights Out on Mar 11, 2022
7	China Tang Kai	ONE 160 Kallang, Singapore	Aug 26, 2022	1330 days (incumbent)	1. def. Interim champion Thanh Le at ONE 166 on Mar 1, 2024
—	United States Thanh Le def. Ilya Freymanov for interim title	ONE Fight Night 15 Bangkok, Thailand	Oct 7, 2023	—
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Thailand Superbon Singha Mawynn def. Giorgio Petrosyan	ONE: First Strike Kallang, Singapore	Oct 15, 2021	456 days	1. def. Marat Grigorian on ONE: X at Mar 26, 2022
2	Belarus Chingiz Allazov	ONE Fight Night 6 Bangkok, Thailand	Jan 14, 2023	595 days	1. def. Marat Grigorian at ONE Fight Night 13 on Aug 5, 2023
—	Thailand Superbon Singha Mawynn def. Marat Grigorian for interim title	ONE Friday Fights 58 Bangkok, Thailand	Apr 5, 2024	—
Allazov vacated the title on August 31, 2024, when he was released from his contract. Interim champion Superbon was officially promoted to undisputed champion on January 6, 2025.
3	Thailand Superbon Singha Mawynn (2) promoted to undisputed champion	–	Jan 6, 2025	466 days (incumbent)	1. def. Interim champion Masaaki Noiri at ONE 173 on Nov 15, 2025
–	Japan Masaaki Noiri def. Tawanchai P.K.Saenchai for interim title	ONE 172 Saitama, Japan	Mar 3, 2025	—
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Thailand Petchmorakot Petchyindee def. Pongsiri P.K.Saenchai	ONE: Warrior's Code Jakarta, Indonesia	Feb 7, 2020	965 days	1. def. Yodsanklai Fairtex at ONE: No Surrender on Jul 31, 2020 2. def. Magnus Andersson at ONE: A New Breed 3 on Sep 18, 2020 3. def. Jimmy Vienot at ONE 157 on May 20, 2022
2	Thailand Tawanchai P.K.Saenchai	ONE 161 Kallang, Singapore	Sep 29, 2022	1296 days (incumbent)	1. def. Jamal Yusupov at ONE Fight Night 7 on Feb 25, 2023 2. def. Superbon Singha Mawynn at ONE Friday Fights 46 on Dec 22, 2023 3. def. Jo Nattawut at ONE 167 on Jun 7, 2024 4. def. Superbon Singha Mawynn at ONE 170 on Jan 24, 2025
–	Scotland Nico Carrillo def. Shadow Singha Mawynn for interim title	ONE Fight Night 40 Bangkok, Thailand	Feb 14, 2026	—

Bantamweight World Championship

Weight limit: 145 lb (65.8 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	South Korea Kim Soo-chul def. Leandro Issa	ONE FC: Rise of Kings Kallang, Singapore	Oct 6, 2012	377 days
—	Brazil Bibiano Fernandes def. Koetsu Okazaki for interim title	ONE FC: Rise to Power Pasay, Philippines	May 31, 2013	—
2	Brazil Bibiano Fernandes	ONE FC: Total Domination Kallang, Singapore	Oct 18, 2013	1848 days	1. def. Masakatsu Ueda at ONE FC: Rise of Heroes on May 2, 2014 2. def. Kim Dae-hwan at ONE FC: Warrior's Way on Dec 5, 2014 3. def. Toni Tauru at ONE: Kingdom of Warriors on Jul 18, 2015 4. def. Kevin Belingon at ONE: Dynasty of Champions (Changsha) on Jan 23, 2016 5. def. Reece McLaren at ONE: Age of Domination on Dec 2, 2016 6. def. Andrew Leone at ONE: Kings & Conquerors on Aug 5, 2017 7. def. Martin Nguyen at ONE: Iron Will on Mar 24, 2018
—	Philippines Kevin Belingon def. Martin Nguyen for interim title	ONE: Reign of Kings Pasay, Philippines	Jul 27, 2018	—
3	Philippines Kevin Belingon	ONE: Heart of the Lion Kallang, Singapore	Nov 9, 2018	142 days
4	Brazil Bibiano Fernandes (2)	ONE: A New Era Tokyo, Japan	Mar 31, 2019	1076 days	1. def. Kevin Belingon at ONE: Century − Part 2 on Oct 13, 2019
5	Brazil John Lineker	ONE: Lights Out Kallang, Singapore	Mar 11, 2022	223 days
Lineker was stripped of the title on October 20, 2022, after failing to make weight for his title defense against Fabrício Andrade at ONE on Prime Video 3.
6	Brazil Fabrício Andrade def. John Lineker	ONE Fight Night 7 Bangkok, Thailand	Feb 25, 2023	1015 days	1. def. Kwon Won-il at ONE 170 on Jan 24, 2025
7	Mongolia Enkh-Orgil Baatarkhuu	ONE Fight Night 38 Bangkok, Thailand	Dec 6, 2025	132 days (incumbent)
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Russia Alaverdi Ramazanov def. Zhang Chenglong	ONE: Mark of Greatness Kuala Lumpur, Malaysia	Dec 6, 2019	413 days
2	Thailand Capitan Petchyindee	ONE: Unbreakable Kallang, Singapore	Jan 22, 2021	428 days	1. def. Mehdi Zatout at ONE: Revolution on Sep 24, 2021
3	Japan Hiroki Akimoto	ONE: X Kallang, Singapore	Mar 26, 2022	238 days
4	Thailand Petchtanong Petchfergus	ONE 163 Kallang, Singapore	Nov 19, 2022	249 days
Petchtanong was stripped of the title on July 26, 2023, due to tested positive for both metenolone and noldenone, which is a banned substance according to International Doping Tests & Management.
5	England Jonathan Haggerty def. Fabrício Andrade	ONE Fight Night 16 Bangkok, Thailand	Nov 4, 2023	895 days (incumbent)	1. def Wei Rui at ONE 171: Qatar on Feb 20, 2025
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Thailand Nong-O Gaiyanghadao def. Han Zihao	ONE: Clash of Legends Bangkok, Thailand	Feb 16, 2019	1526 days	1. def. Hiroaki Suzuki at ONE: Warriors of Light on May 10, 2019 2. def. Brice Delval at ONE: Immortal Triumph on Sep 6, 2019 3. def. Saemapetch Fairtex at ONE: Edge Of Greatness on Nov 22, 2019 4. def. Rodlek P.K. Saenchai at ONE: Collision Course on Dec 18, 2020 5. def. Felipe Lobo at ONE: X on Mar 26, 2022 6. def. Liam Harrison at ONE on Prime Video 1 on Aug 27, 2022 7. def. Alaverdi Ramazanov at ONE Friday Fights 1 on Jan 20, 2023
2	England Jonathan Haggerty	ONE Fight Night 9 Bangkok, Thailand	Apr 22, 2023	503 days	1. def. Felipe Lobo at ONE Fight Night 19 on Feb 17, 2024
3	Thailand Superlek Kaitmuukao	ONE 168 Denver, CO, U.S.	Sep 6, 2024	183 days
–	Algeria Nabil Anane def. Nico Carrillo for interim title	ONE 170 Bangkok, Thailand	Jan 24, 2025	–
Superlek was stripped of the title on March 22, 2025, after failing to hydration test for his title unification bout against Nabil Anane at ONE 172. Anane has officially promoted to undisputed champion during ONE Friday Fights 114 on June 27, 2025.
4	Algeria Nabil Anane promoted to undisputed champion	–	Jun 27, 2025	266 days
5	Thailand Rambolek Chor.Ajalaboon	ONE Friday Fights 147 Bangkok, Thailand	Mar 20, 2026	28 days (incumbent)

Flyweight World Championship

Weight limit: 135 lb (61.2 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Brazil Adriano Moraes def. Geje Eustaquio	ONE: Rise of the Kingdom Phnom Penh, Cambodia	Sep 12, 2014	435 days	1. def. Riku Shibuya at ONE: Age of Champions on Mar 13, 2015
2	Kazakhstan Kairat Akhmetov	ONE: Dynasty of Champions 3 Beijing, China	Nov 21, 2015	623 days
—	Brazil Adriano Moraes def. Tilek Batyrov for interim title	ONE: Heroes of the World Macau, SAR, China	Aug 13, 2016	—
3	Brazil Adriano Moraes (2)	ONE: Kings & Conquerors Macau, SAR, China	Aug 5, 2017	322 days (757 days)	1. def. Danny Kingad at ONE: Legends of the World on Nov 10, 2017
—	Philippines Geje Eustaquio def. Kairat Akhmetov for interim title	ONE: Global Superheroes Pasay, Philippines	Jan 26, 2018	—
4	Philippines Geje Eustaquio	ONE: Pinnacle of Power Beijing, China	Jun 23, 2018	216 days
5	Brazil Adriano Moraes (3)	ONE: Hero's Ascent Pasay, Philippines	Jan 25, 2019	1310 days (2067 days)	1. def. Demetrious Johnson at ONE on TNT 1 on Apr 7, 2021 2. def. Yuya Wakamatsu at ONE: X on Mar 26, 2022
6	United States Demetrious Johnson	ONE on Prime Video 1 Kallang, Singapore	Aug 27, 2022	741 days	1. def. Adriano Moraes at ONE Fight Night 10 on May 5, 2023
Johnson announced his retirement from MMA during at ONE 168 on September 6, 2024.
7	Japan Yuya Wakamatsu def. Adriano Moraes	ONE 172 Saitama, Japan	Mar 23, 2025	390 days (incumbent)	1. def. Joshua Pacio at ONE 173 on Nov 16, 2025
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Thailand Petchdam Petchyindee def. Elias Mahmoudi	ONE: Warriors of Light Bangkok, Thailand	May 10, 2019	98 days
2	Netherlands Ilias Ennahachi	ONE: Dreams of Gold Bangkok, Thailand	Aug 16, 2019	1236 days	1. def. Wang Wenfeng at ONE: Age Of Dragons on Nov 16, 2019 2. def. Superlek Kiatmuukao at ONE: Fists Of Fury on Feb 26, 2021
Ennahachi vacated the belt on January 3, 2023, due to his inability to make the flyweight limit of 135 pounds while hydrated.
3	Thailand Superlek Kiatmuukao def. Daniel Puertas Gallardo	ONE Fight Night 6 Bangkok, Thailand	Jan 14, 2023	1189 days (incumbent)	1. def. Danial Williams at ONE Fight Night 8 on Mar 25, 2023 2. def. Takeru Segawa at ONE 165 on Jan 28, 2024
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Thailand Sam-A Gaiyanghadao def. Sergio Wielzen	ONE: Unstoppable Dreams Kallang, Singapore	May 18, 2018	351 days
2	England Jonathan Haggerty	ONE: For Honor Jakarta, Indonesia	May 4, 2019	90 days
3	Thailand Rodtang Jitmuangnon	ONE: Dawn of Heroes Pasay, Philippines	Aug 2, 2019	1924 days	1. def. Walter Gonçalves at ONE: Century − Part 2 on Oct 13, 2019 2. def. Jonathan Haggerty at ONE: A New Tomorrow on Jan 10, 2020 3. def. Petchdam Petchyindee at ONE: No Surrender on Jul 31, 2020 4. def. Joseph Lasiri at ONE on Prime Video 4 on Nov 19, 2022 5. def. Edgar Tabares at ONE Fight Night 10 on May 5, 2023
Rodtang was stripped of the title on November 7, 2024, after failing to make weight and failing his hydration test for his title defense against Jacob Smith at ONE 169.
Submission grappling
No.	Name	Event	Date	Reign	Defenses
1	United States Mikey Musumeci def. Cleber Souza	ONE on Prime Video 2 Kallang, Singapore	Oct 1, 2022	705 days	1. def. Gantumur Bayanduuren at ONE Fight Night 6 on Jan 14, 2023 2. def. Osamah Almarwai at ONE Fight Night 10 on May 5, 2023 3. def. Jarred Brooks at ONE Fight Night 13 on August 5, 2023
Musumeci was stripped of the title on September 5, 2024, after failing to make weight for his title defense against Bebeto Oliveira at ONE 168.
2	Brazil Diogo Reis def. Daiki Yonekura	ONE Fight Night 38 Bangkok, Thailand	Dec 6, 2025	133 days (incumbent)

Strawweight World Championship

Weight limit: 125 lb (56.7 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	Thailand Dejdamrong Sor Amnuaysirichoke def. Roy Doliguez	ONE: Warrior's Quest Kallang, Singapore	May 22, 2015	371 days
2	Japan Yoshitaka Naito	ONE: Kingdom of Champions Bangkok, Thailand	May 27, 2016	561 days	1. def. Joshua Pacio at ONE: State of Warriors on Oct 7, 2016
3	Brazil Alex Silva	ONE: Warriors of the World Bangkok, Thailand	Dec 9, 2017	154 days
4	Japan Yoshitaka Naito (2)	ONE: Grits And Glory Jakarta, Indonesia	May 12, 2018	133 days (694 days)
5	Philippines Joshua Pacio	ONE: Conquest of Heroes Jakarta, Indonesia	Sep 22, 2018	119 days
6	Japan Yosuke Saruta	ONE: Eternal Glory Jakarta, Indonesia	Jan 19, 2019	83 days
7	Philippines Joshua Pacio (2)	ONE: Roots of Honor Pasay, Philippines	Apr 12, 2019	1331 days (1450 days)	1. def. Rene Catalan at ONE: Masters Of Fate on Nov 8, 2019 2. def. Alex Silva at ONE: Fire & Fury on Jan 31, 2020 3. def. Yosuke Saruta at ONE: Revolution on Sep 24, 2021
8	United States Jarred Brooks	ONE 164 Pasay, Philippines	Dec 3, 2022	454 days
9	Philippines Joshua Pacio (3)	ONE 166 Lusail, Qatar	Mar 1, 2024	777 days (incumbent)	1. def. Interim champion Jarred Brooks at ONE 171: Qatar on Feb 20, 2025
—	United States Jarred Brooks def. Gustavo Balart for interim title	ONE Fight Night 24 Bangkok, Thailand	Aug 3, 2024	—
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Thailand Sam-A Gaiyanghadao def. Wang Junguang	ONE: Mark Of Greatness Kuala Lumpur, Malaysia	Dec 6, 2019	806 days
Sam-A vacated the title on February 19, 2022 due to retirement.
2	Canada Jonathan Di Bella def. Zhang Peimian	ONE 162 Kuala Lumpur, Malaysia	Oct 21, 2022	531 days	1. def. Danial Williams at ONE Fight Night 15 on Oct 7, 2023
Di Bella was stripped of the title on April 4, 2024, after failing to make hydration for his title defense against Prajanchai P.K.Saenchai at ONE Friday Fights 58. He was stripped of his title after failing to meet the required hydration levels at the weigh-ins.
3	Thailand Prajanchai P.K.Saenchai def. Jonathan Di Bella	ONE Friday Fights 68 Bangkok, Thailand	Jun 28, 2024	463 days
—	Canada Jonathan Di Bella def. Sam-A Gaiyanghadao for interim title	ONE 172 Saitama, Japan	Mar 23, 2025	–
4	Canada Jonathan Di Bella (2)	ONE Fight Night 36 Bangkok, Thailand	Oct 4, 2025	195 days (incumbent)
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Thailand Sam-A Gaiyanghadao def. Rocky Ogden	ONE: King of the Jungle Kallang, Singapore	Feb 28, 2020	518 days	1. def. Josh Tonna at ONE: Reign of Dynasties on Oct 9, 2020
2	Thailand Prajanchai P.K.Saenchai	ONE: Battleground Kallang, Singapore	Jul 30, 2021	294 days
3	Italy Joseph Lasiri	ONE 157 Kallang, Singapore	May 20, 2022	581 days
—	Thailand Prajanchai P.K.Saenchai def. Sam-A Gaiyanghadao for interim title	ONE Friday Fights 22 Bangkok, Thailand	Jun 23, 2023	—
4	Thailand Prajanchai P.K.Saenchai (2)	ONE Friday Fights 46 Bangkok, Thailand	Dec 22, 2023	847 days (incumbent)	1. def. Ellis Barboza at ONE Fight Night 28 on Feb 7, 2025

Atomweight World Championship

Weight limit: 115 lb (52.2 kg)

No.	Name	Event	Date	Reign	Defenses
Muay Thai
1	Japan Nadaka Yoshinari def. Numsurin Chor.Ketwina	ONE 173 Tokyo, Japan	Nov 16, 2025	152 days (incumbent)

Women's championship history

Women's Strawweight World Championship

Weight limit: 125 lb (56.7 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	China Xiong Jing Nan def. Tiffany Teo	ONE: Kings of Courage Jakarta, Indonesia	Jan 20, 2018	2987 days	1. def. Laura Balin at ONE: Pinnacle of Power on Jun 23, 2018 2. def. Samara Santos at ONE: Beyond the Horizon on Sep 8, 2018 3. def. Angela Lee at ONE: A New Era on Mar 31, 2019 4. def. Tiffany Teo at ONE: Inside the Matrix on Oct 3, 2020 5. def. Michelle Nicolini at ONE: Empower on Sep 3, 2021 6. def. Ayaka Miura at ONE: Heavy Hitters on Jan 14, 2022 7. def. Angela Lee at ONE on Prime Video 2 on Oct 1, 2022
On March 26, 2026, it was announced that the Women's Strawweight MMA division was being discontinued.
Kickboxing
1	United States Jackie Buntan def. Anissa Meksen	ONE 169 Bangkok, Thailand	Nov 9, 2024	462 days
2	Austria Stella Hemetsberger def. Jackie Buntan	ONE Fight Night 40 Bangkok, Thailand	Feb 14, 2026	62 days (incumbent)
Muay Thai
1	Sweden Smilla Sundell def. Jackie Buntan	ONE 156 Kallang, Singapore	Apr 22, 2022	741 days	1. def. Allycia Rodrigues at ONE Fight Night 14 on Sep 30, 2023
Sundell was stripped of the title on May 2, 2024, after failing to make weight for her title defense against Natalia Diachkova at ONE Fight Night 22.
2	Austria Stella Hemetsberger def. Jackie Buntan	ONE Fight Night 35 Bangkok, Thailand	Sept 6, 2025	223 days (incumbent)

Women's Atomweight World Championship

Weight limit: 115 lb (52.2 kg)

No.	Name	Event	Date	Reign	Defenses
Mixed martial arts (MMA)
1	United States Angela Lee def. Mei Yamaguchi	ONE: Ascent to Power Kallang, Singapore	May 6, 2016	2703 days	1. def. Jenny Huang at ONE: Warrior Kingdom on Mar 11, 2017 2. def. Istela Nunes at ONE: Dynasty of Heroes on May 26, 2017 3. def. Mei Yamaguchi at ONE: Unstoppable Dreams on May 18, 2018 4. def. Xiong Jing Nan at ONE: Century − Part 1 on Oct 13, 2019 5. def. Stamp Fairtex at ONE: X on Mar 26, 2022
Lee vacated the title on September 30, 2023 due to retirement from MMA at ONE Fight Night 14.
2	Thailand Stamp Fairtex def. Ham Seo-hee	ONE Fight Night 14 Kallang, Singapore	Sep 30, 2023	580 days
—	Philippines Denice Zamboanga def. Alyona Rassohyna for interim title	ONE Fight Night 27 Bangkok, Thailand	Jan 11, 2025	—
Fairtex vacated the title on May 2, 2025, due to a knee injury.
3	Philippines Denice Zamboanga promoted to undisputed champion	—	May 2, 2025	350 days (incumbent)
Kickboxing
No.	Name	Event	Date	Reign	Defenses
1	Taiwan Chuang Kai Ting def. Yodcherry Sityodtong	ONE: Battle for the Heavens Guangzhou, China	Jul 7, 2018	91 days
2	Thailand Stamp Fairtex	ONE: Kingdom of Heroes Bangkok, Thailand	Oct 6, 2018	510 days
3	United States Janet Todd	ONE: King of the Jungle Kallang, Singapore	Feb 28, 2020	1471 days
—	Thailand Phetjeeja Lukjaoporongtom def. Anissa Meksen for interim title	ONE Friday Fights 46 Bangkok, Thailand	Dec 22, 2023	—
4	Thailand Phetjeeja Lukjaoporongtom	ONE Fight Night 20 Bangkok, Thailand	Mar 9, 2024	769 days (incumbent)	1. def. Kana Morimoto at ONE 172 on March 23, 2025
Muay Thai
No.	Name	Event	Date	Reign	Defenses
1	Thailand Stamp Fairtex def. Janet Todd	ONE: Call to Greatness Kallang, Singapore	Feb 22, 2019	553 days	1. def. Alma Juniku at ONE: Legendary Quest on Jun 15, 2019
2	Brazil Allycia Rodrigues	ONE: A New Breed Bangkok, Thailand	Aug 28, 2020	2058 days (incumbent)	1. def. interim champion Janet Todd at ONE Fight Night 8 on Mar 25, 2023 2. def. Cristina Morales at ONE Fight Night 20 on Mar 9, 2024 3. def. Marie McManamon at ONE Fight Night 29 on Mar 8, 2025 4. def. Johanna Persson at ONE Fight Night 33 on Jul 12, 2025
—	United States Janet Todd def. Lara Fernandez for interim title	ONE 159 Kallang, Singapore	Jul 22, 2022	—
Submission grappling
No.	Name	Event	Date	Reign	Defenses
1	United States Danielle Kelly def. Jessa Khan	ONE Fight Night 14 Kallang, Singapore	Sep 30, 2023	308 days
2	Brazil Mayssa Bastos	ONE Fight Night 24 Bangkok, Thailand	Aug. 3, 2024	622 days (incumbent)	1. def. Danielle Kelly at ONE Fight Night 26 on Dec 6th, 2024
Atomweight Submission grappling title was scrapped

Tournament winners

Event	Date	Division	Winner	Runner-up
ONE FC: Rise to Power	May 31, 2013	Bantamweight	Japan Masakatsu Ueda	Philippines Kevin Belingon
ONE FC: Warrior Spirit	Nov 15, 2013	Malaysia Featherweight	Malaysia A.J. Lias Mansor	Malaysia Melvin Yeoh
ONE FC: Rise of the Kingdom	Sep 12, 2014	Cambodia Featherweight	Cambodia Samang Dun	Cambodia Chan Rothana
ONE FC: Dynasty of Champions	Dec 19, 2014	Beijing Featherweight	China Li Kaiwen	China Wang Yawei
Beijing Flyweight	China Li Weibin	China Wang Wei
ONE: Dynasty of Champions 2	Jun 20, 2015	Guangzhou Featherweight	China Huang Diyuan	China Ma Jiawen
Guangzhou Flyweight	China Wu Ze	China Yang Jianbing
ONE: Kingdom of Warriors	Jul 18, 2015	Myanmar Featherweight	Myanmar Tha Pyay Nyo	Myanmar Myo Man Thit
Myanmar Lightweight	Myanmar Thway Thit Aung	Myanmar Saw Ba Oo
ONE: Dynasty of Champions 3	Nov 21, 2015	Beijing Featherweight Tournament	China Yang Sen	China Zhang Jiacai
ONE: Dynasty of Champions 4	Jan 23, 2016	Changsha Bantamweight	China Ma Haobin	China Huoyou Gabu
ONE: Dynasty of Champions 6	Jul 2, 2016	Hefei Flyweight	China Huoyou Gabu	China Li Haojie
ONE: State of Warriors	Oct 7, 2016	Myanmar Featherweight	Myanmar Phoe Thaw	Myanmar Saw Yan Paing
ONE: Light of a Nation	Jun 30, 2017	Myanmar Flyweight	Myanmar Saw Min Min	Myanmar Shwe Kyaung Thar
ONE: Century – Part 1	Oct 13, 2019	Lightweight	United States Christian Lee	Turkey Saygid Guseyn Arslanaliev
Flyweight	United States Demetrious Johnson	Philippines Danny Kingad
ONE: Century – Part 2	Featherweight Kickboxing	Italy Giorgio Petrosyan	France Samy Sana
ONE: A New Breed	Aug 28, 2020	Bantamweight Muay Thai	Thailand Rodlek P.K.Saenchai	Thailand Kulabdam Sor.Jor.Piek-U-Thai
ONE: Winter Warriors	Dec 3, 2021	Women's Atomweight	Thailand Stamp Fairtex	India Ritu Phogat
ONE: X	Mar 26, 2022	Featherweight Kickboxing	Belarus Chingiz Allazov	Thailand Sitthichai Sitsongpeenong
ONE 163	Nov 19, 2022	Heavyweight Kickboxing	Ukraine Roman Kryklia	Iran Iraj Azizpour

Records

Most wins in title bouts

Title wins	Champion	Weight class	W	D	NC	L
11	Brazil Bibiano Fernandes	Bantamweight of MMA	11	0	0	2
10	Suriname Regian Eersel	Lightweight of Kickboxing Lightweight of Muay Thai	6 4	0 0	0 0	1 0
8	Brazil Adriano Moraes	Flyweight of MMA	8	0	0	4
China Xiong Jing Nan	Women's Strawweight of MMA Women's Atomweight of MMA	8 0	0 0	0 0	0 1
Thailand Nong-O Gaiyanghadao	Bantamweight of Muay Thai	8	0	0	1
6	Myanmar Aung La Nsang	Light Heavyweight of MMA Middleweight of MMA	2 4	0 0	0 0	1 2
United States Angela Lee	Women's Strawweight of MMA Women's Atomweight of MMA	0 6	0 0	0 0	2 0
Thailand Rodtang Jitmuangnon	Flyweight of Muay Thai	6	0	0	0
5	Australia Martin Nguyen	Lightweight of MMA Featherweight of MMA Bantamweight of MMA	1 4 0	0 0 0	0 0 0	0 2 2
Philippines Joshua Pacio	Strawweight of MMA	5	0	0	3
United States Christian Lee	Welterweight of MMA Lightweight of MMA Featherweight of MMA	1 4 0	0 0 0	0 0 0	0 1 1
4	Russia Anatoly Malykhin	Heavyweight of MMA Light Heavyweight of MMA Middleweight of MMA	2 1 1	0 0 0	0 0 0	1 0 0
Japan Shinya Aoki	Welterweight of MMA Lightweight of MMA	0 4	0 0	0 0	1 2
Thailand Sam-A Gaiyanghadao	Strawweight of Kickboxing Flyweight of Muay Thai Strawweight of Muay Thai	1 1 2	0 0 0	0 0 0	0 1 1
Russia Marat Gafurov	Featherweight of MMA	4	0	0	1
United States Ben Askren	Welterweight of MMA	4	0	1	0
Netherlands Reinier de Ridder	Light Heavyweight of MMA Middleweight of MMA	1 3	0 0	0 0	1 1
Thailand Petchmorakot Petchyindee	Featherweight of Muay Thai	4	0	0	1
United States Mikey Musumeci	Flyweight of Submission grappling	4	0	0	0

Most consecutive title defenses

Defenses	Champion	Division	Period
7	Brazil Bibiano Fernandes	Bantamweight of MMA	October 13, 2013 — July 27, 2018
China Xiong Jing Nan	Women's Strawweight of MMA	January 20, 2018 — present
Thailand Nong-O Gaiyanghadao	Bantamweight of Muay Thai	February 16, 2019 — April 22, 2023
5	United States Angela Lee	Women's Atomweight of MMA	May 6, 2016 — September 30, 2023
Thailand Rodtang Jitmuangnon	Flyweight of Muay Thai	August 2, 2019 — November 7, 2024
4	Suriname Regian Eersel	Lightweight of Kickboxing	May 17, 2019 — present
3	United States Ben Askren	Welterweight of MMA	August 29, 2014 — October 24, 2018
Myanmar Aung La Nsang	Middleweight of MMA	June 30, 2017 — October 30, 2020
Australia Martin Nguyen	Featherweight of MMA	August 18, 2017 — October 30, 2020
Thailand Petchmorakot Petchyindee	Featherweight of Muay Thai	February 7, 2020 — September 29, 2022
Philippines Joshua Pacio	Strawweight of MMA	April 12, 2019 — December 3, 2022
United States Mikey Musumeci	Flyweight of Submission Grappling	October 1, 2022 — September 5, 2024

Multi-division champions

Interim title

No.	Champion	Division	Won	Lost	Defenses	Reign	Total Reign
1	Australia Martin Nguyen	Lightweight of MMA	November 10, 2017 (ONE: Legends of the World)	September 28, 2018 (Stripped)	0	322 days	1491 days
Featherweight of MMA	August 18, 2017 (ONE: Quest for Greatness)	October 30, 2020 (ONE: Inside the Matrix)	3	1169 days
2	Myanmar Aung La Nsang	Light Heavyweight of MMA	February 23, 2018 (ONE: Quest for Gold)	April 28, 2021 (ONE on TNT 4)	1	1161 days	2379 days
Middleweight of MMA	June 30, 2017 (ONE: Light of a Nation)	October 30, 2020 (ONE: Inside the Matrix)	3	1218 days
3	Thailand Sam-A Gaiyanghadao	Strawweight of Kickboxing	December 6, 2019 (ONE: Mark Of Greatness)	February 19, 2022 (Retirement)	0	806 days	1674 days
Flyweight of Muay Thai	May 18, 2018 (ONE: Unstoppable Dreams)	May 4, 2019 (ONE: For Honor)	0	350 days
Strawweight of Muay Thai	February 28, 2020 (ONE: King of the Jungle)	30 July 2021 (ONE: Battleground)	1	518 days
4	Thailand Stamp Fairtex	Women's Atomweight of Kickboxing	October 6, 2018 (ONE: Kingdom of Heroes)	February 28, 2020 (ONE: King of the Jungle)	0	510 days	1063 days
Women's Atomweight of Muay Thai	February 22, 2019 (ONE: Call to Greatness)	August 28, 2020 (ONE: A New Breed)	1	553 days
5	Netherlands Reinier de Ridder	Light Heavyweight of MMA	April 28, 2021 (ONE on TNT 4)	December 3, 2022 (ONE on Prime Video 5)	0	584 days	3810 days
Middleweight of MMA	October 30, 2020 (ONE: Inside the Matrix)	March 1, 2024 (ONE 166)	2	1995 days
6	Suriname Regian Eersel	Lightweight of Muay Thai	October 22, 2022 (ONE on Prime Video 3)	Present	3	1273 days	3800 days
Lightweight of Kickboxing	May 17, 2019 (ONE: Enter the Dragon)	Present	4	2527 days
7	United States Christian Lee	Welterweight of MMA	November 19, 2022 (ONE on Prime Video 4)	Present	0	1245 days	3436 days
Lightweight of MMA	August 26, 2022 (ONE 160)	Present	0	1330 days
May 17, 2019 (ONE: Enter the Dragon)	September 24, 2021 (ONE: Revolution)	2	861 days
8	England Jonathan Haggerty	Bantamweight of Muay Thai	April 22, 2023 (ONE Fight Night 9)	September 7, 2024 (ONE 168)	0	504 days	1181 days
Flyweight of Muay Thai	May 4, 2019 (ONE: For Honor)	August 2, 2019 (ONE: Dawn of Heroes)	0	90 days
9	Russia Anatoly Malykhin	Heavyweight of MMA	June 23, 2023 (ONE Friday Fights 22)	November 9, 2024 (ONE 169)	0	505 days	3534 days
February 11, 2022 (ONE: Bad Blood)	June 23, 2023 (ONE Friday Fights 22)	0	497 days
Light Heavyweight of MMA	December 3, 2022 (ONE on Prime Video 5)	Present	0	1231 days
Middleweight of MMA	March 1, 2024 (ONE 166)	Present	0	777 days
10	Thailand Prajanchai P.K.Saenchai	Strawweight of Muay Thai	December 22, 2023 (ONE: Friday Fights 46)	Present	0	847 days	1505 days
Strawweight of Kickboxing	June 28, 2024 (ONE Friday Fights 68)	Present	0	658 days

Simultaneous two division champions

This table, different from the previous one, only counts the periods in which the fighter loaded the titles simultaneously and the defenses in that period of time.

No.	Champion	Division	Span	Defenses	Simultaneous Reign
1	Australia Martin Nguyen	Lightweight of MMA	November 10, 2017 — September 28, 2018	0	322 days
Featherweight of MMA	1
2	Myanmar Aung La Nsang	Light Heavyweight of MMA	February 23, 2018 — October 30, 2020	1	980 days
Middleweight of MMA	3
3	Thailand Sam-A Gaiyanghadao	Strawweight of Kickboxing	February 28, 2020 — July 30, 2021	0	518 days
Strawweight of Muay Thai	1
4	Thailand Stamp Fairtex	Women's Atomweight of Kickboxing	February 22, 2019 — February 28, 2020	0	371 days
Women's Atomweight of Muay Thai	1
5	Netherlands Reinier de Ridder	Light Heavyweight of MMA	April 28, 2021 — December 3, 2022	0	584 days
Middleweight of MMA	2
6	Suriname Regian Eersel	Lightyweight of Muay Thai	October 22, 2022 — present	2	1,273 days
Lightweight of Kickboxing	4
7	United States Christian Lee	Welteryweight of MMA	November 19, 2022 — present	0	1,246 days
Lightweight of MMA	0
7	Russia Anatoly Malykhin	Heavyweight of MMA	June 23, 2023 — November 9, 2024	0	505 days
Light Heavyweight of MMA	0
8	England Jonathan Haggerty	Bantamweight of Muay Thai	November 4, 2023 — present	0	895 days
Bantamweight of Kickboxing	0
9	Ukraine Roman Kryklia	Light Heavyweight of Kickboxing	December 8, 2023 — present	0	861 days
Heavyweight of Muay Thai	0

Champions by nationality

Fighters with multiple title reigns in a specific division are only counted once. Interim champions who never became linear champions are only listed in parentheses.

Country	MMA	Kickboxing	Muay Thai	Submission Grappling	Tournament	Total (LC only)
Thailand Thailand	2	8	8	0	2	18
United States United States	8	1	0 (1)	4	2	13
Brazil Brazil	6	0	1	1	0	8
Japan Japan	5	1	1	0	1	6
Russia Russia	5	1	0	0	0	6
Philippines Philippines	6	0	0	0	0	6
South Korea South Korea	3	0	0	0	0	3
Netherlands Netherlands	2	1	0	0	0	3
England England	0	1	2	0	0	3
China China	2	0	0	0	7	2
Myanmar Myanmar	2	0	0	0	4	2
Australia Australia	2	0	0	0	0	2
Kazakhstan Kazakhstan	2	0	0	0	0	2
Sweden Sweden	1	0	1	0	0	2
Canada Canada	1	1	0	0	0	2
Ukraine Ukraine	0	1	1	0	0	2
Suriname Suriname	0	1	1	0	0	2
Senegal Senegal	1	0	0	0	0	1
Mongolia Mongolia	1	0	0	0	0	1
Kyrgyzstan Kyrgyzstan	1	0	0	0	0	1
Italy Italy	0	1	1	0	1	1
Belarus Belarus	0	1	0	0	1	1
Taiwan Taiwan	0	1	0	0	0	1
France France	0	1	0	0	0	1
Cambodia Cambodia	0	0	0	0	1	0
Malaysia Malaysia	0	0	0	0	1	0

Missed weight/Failed hydration title fights

Throughout the history of ONE Championship, there has been multiple instances of champions or title challengers missing weight, or failing hydration tests. These are the official fights that still happened after the fails.

Event	Date	Championship	Result	Notes
ONE: Global Rivals	Apr 15, 2016	Welterweight	United States Ben Askren (c) (170 lb)	def.	Russia Nikolay Aleksakhin (187 lb)	Aleksakhin missed weight, and the contest was switched to a catchweight (188 lb) non-title bout.
ONE on Prime Video 3	Oct 21, 2022	Bantamweight MMA	Brazil John Lineker (c) (145.75 lb)	vs.	Brazil Fabrício Andrade (145 lb)	Lineker was stripped of the title, and only Andrade was eligible to win title. The fight ended in a no contest.
ONE on Prime Video 3	Oct 21, 2022	Lightweight Submission Grappling	United States Kade Ruotolo (169 lb)	def.	Russia Uali Kurzhev (hydration test failed at 1.0274)	The match was scheduled at 170 lb for the inaugural ONE Lightweight Submission Grappling World Championship. Kurzhev failed his hydration test, and the bout was changed to a 174 lb catchweight match. Only Ruotolo was eligible to win the title.
ONE on Prime Video 4	Nov 19, 2022	Middleweight MMA	Canada United States Singapore Christian Lee (185 lb)	def.	Kyrgyzstan Russia Kiamrian Abbasov (c) (186.25 lbs)	Abbasov was stripped of the title, and only Lee was eligible to win the title.
ONE Friday Fights 34	September 22, 2023	Flyweight Muay Thai	Thailand Superlek Kiatmuukao (140 lb)	def.	Thailand Rodtang Jitmuangnon (135 lb)	The bout was originally contested for the ONE Flyweight Muay Thai World Championship. The bout was switched over to a three-round catchweight (140 lb) fight.
ONE Fight Night 22	May 4, 2024	Women’s Strawweight Muay Thai	Sweden Smilla Sundell (c) (126.5 lb)	def.	Russia Natalia Diachkova (125 lb)	Sundell was stripped of the title, and only Diachkova was eligible to win the title.
ONE Fight Night 24	August 2, 2024	Strawweight MMA	United States Jarred Brooks (123.25 lb)	def.	Cuba Gustavo Balart (126 lb)	The fight was scheduled for the interim ONE Strawweight MMA World Championship. The bout was changed to a 126 lb catchweight limit. Only Brooks was eligible to win the title.
ONE 169	Nov 8, 2024	Flyweight Muay Thai	Thailand Rodtang Jitmuangnon (c) (135.5 lb) (hydration test failed at 1.0241)	def.	England Jacob Smith (135 lb)	Jitmuangnon was stripped of the title, and only Smith was eligible to win the title.
ONE 172	Mar 23, 2025	Bantamweight Muay Thai	Thailand Superlek Kiatmuukao (c) (146.75 lb) (failed hydration test at 1.0237)	def.	Algeria Thailand France Nabil Anane (144.75 lb)	Kiatmuukao was stripped of the title, and the bout was changed to a non-title contest. Anane was the concurrent interim Bantamweight Muay Thai champion before this fight, and he was promoted to undisputed champion in May of 2025.
ONE Fight Night 30	Apr 5, 2025	Lightweight Kickboxing	Suriname Netherlands Regian Eersel (c) (168.5 lb) (failed his hydration test at 1.0270)	def.	France Alexis Nicolas (168.75 lb)	Eersel was stripped of the title, and only Nicolas was eligible to win the title.
ONE Friday Fights 147	Mar 20, 2026	Flyweight Muay Thai	Russia Asadula Imangazaliev (139.8 lb) (failed hydration test at 1.0270)	def.	Thailand Nong-O Hama (134 lb)	Title was vacant before the fight. Imangazaliev missed weight and failed his hydration test, and the contest was changed to catchweight limit. Only Nong-O was available to win the title.

External links

at ONE's official website