2025 Busan Open – Singles
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Yasutaka Uchiyama was the defending champion but lost in the quarterfinals to Adam Walton.
Térence Atmane won the title after defeating Walton 6–3, 6–4 in the final.
Seeds
- Australia Adam Walton (final)
- United States Christopher Eubanks (first round)
- United States Brandon Holt (semifinals)
- Australia Tristan Schoolkate (first round)
- Japan Yasutaka Uchiyama (quarterfinals)
- Australia Li Tu (second round)
- Japan James Trotter (first round)
- France Térence Atmane (champion)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- ITF = ITF entry
- PR = Protected ranking
- SR = Special ranking
- SE = Special exempt
- JE = Junior exempt
- JR = Junior Accelerator Programme entrant
- CO = College Accelerator Programme entrant
- NG = Next Gen Accelerator Program entrant
- w/o = Walkover
- r = Retired
- d = Defaulted
Finals
| Semifinals | Final | ||||||||||||
| 1 | Australia Adam Walton | 78 | 63 | 7 | |||||||||
| PR | Australia Jason Kubler | 66 | 77 | 5 | |||||||||
| 1 | Australia Adam Walton | 3 | 4 | ||||||||||
| 8 | France Térence Atmane | 6 | 6 | ||||||||||
| 3 | United States Brandon Holt | 65 | 6 | 3 | |||||||||
| 8 | France Térence Atmane | 77 | 3 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Australia A Walton | 6 | 6 | ||||||||||||||||||||||||
| Japan R Noguchi | 0 | 2 | 1 | Australia A Walton | 6 | 77 | |||||||||||||||||||||
| Japan S Shimabukuro | 3 | 1 | Japan Y Shimizu | 2 | 64 | ||||||||||||||||||||||
| Japan Y Shimizu | 6 | 6 | 1 | Australia A Walton | 7 | 5 | 6 | ||||||||||||||||||||
| WC | South Korea S-w Kwon | 3 | 6 | 7 | 5 | Japan Y Uchiyama | 5 | 7 | 3 | ||||||||||||||||||
| France A Escoffier | 6 | 1 | 5 | WC | South Korea S-w Kwon | 1 | 6 | 61 | |||||||||||||||||||
| Q | Germany M Rosenkranz | 64 | 3 | 5 | Japan Y Uchiyama | 6 | 1 | 77 | |||||||||||||||||||
| 5 | Japan Y Uchiyama | 77 | 6 | 1 | Australia A Walton | 78 | 63 | 7 | |||||||||||||||||||
| 4 | Australia T Schoolkate | 4 | 6 | 3 | PR | Australia J Kubler | 66 | 77 | 5 | ||||||||||||||||||
| WC | South Korea Gerard Campaña Lee | 6 | 3 | 6 | WC | South Korea G Campaña Lee | 3 | 0 | |||||||||||||||||||
| PR | Australia J Kubler | 7 | 6 | PR | Australia J Kubler | 6 | 6 | ||||||||||||||||||||
| Japan R Sakamoto | 5 | 4 | PR | Australia J Kubler | 6 | 6 | |||||||||||||||||||||
| Finland E Ruusuvuori | 2 | 4 | WC | South Korea H Chung | 2 | 4 | |||||||||||||||||||||
| WC | South Korea H Chung | 6 | 6 | WC | South Korea H Chung | 3 | 6 | 6 | |||||||||||||||||||
| Q | M Sharipov | 2 | 6 | 1 | 6 | Australia L Tu | 6 | 3 | 4 | ||||||||||||||||||
| 6 | Australia L Tu | 6 | 3 | 6 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | Japan J Trotter | 3 | 3 | ||||||||||||||||||||||||
| Chinese Taipei Y-h Hsu | 6 | 6 | Chinese Taipei Y-h Hsu | 6 | 6 | ||||||||||||||||||||||
| Q | United Kingdom J Monday | 3 | 4 | Q | South Korea S-h Shin | 2 | 2 | ||||||||||||||||||||
| Q | South Korea Shin San-hui | 6 | 6 | Chinese Taipei Y-h Hsu | 2 | 2 | |||||||||||||||||||||
| Japan Y Watanuki | 3 | 64 | 3 | United States B Holt | 6 | 6 | |||||||||||||||||||||
| Australia A Bolt | 6 | 77 | Australia A Bolt | 3 | 4 | ||||||||||||||||||||||
| France C Lestienne | 6 | 62 | 4 | 3 | United States B Holt | 6 | 6 | ||||||||||||||||||||
| 3 | United States B Holt | 1 | 77 | 6 | 3 | United States B Holt | 65 | 6 | 3 | ||||||||||||||||||
| 8 | France T Atmane | 77 | 77 | 8 | France T Atmane | 77 | 3 | 6 | |||||||||||||||||||
| Australia J McCabe | 64 | 62 | 8 | France T Atmane | 6 | 2 | 6 | ||||||||||||||||||||
| Q | Norway V Durasovic | 6 | 3 | 2 | Australia O Jasika | 3 | 6 | 4 | |||||||||||||||||||
| Australia O Jasika | 0 | 6 | 6 | 8 | France T Atmane | 6 | 1 | 6 | |||||||||||||||||||
| A Kachmazov | 79 | 4 | 3 | Q | I Simakin | 4 | 6 | 3 | |||||||||||||||||||
| Q | I Simakin | 67 | 6 | 6 | Q | I Simakin | 77 | 6 | |||||||||||||||||||
| United States Z Svajda | 3 | 77 | 6 | United States Z Svajda | 63 | 1 | |||||||||||||||||||||
| 2 | United States C Eubanks | 6 | 63 | 0 |