2021 Split Open – Singles
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Francisco Cerúndolo was the defending champion but chose not to defend his title.
Blaž Rola won the title after defeating Blaž Kavčič 2–6, 6–3, 6–2 in the final.
Held in Split, Croatia (hence the name of the tournament) the tournament took place from April 5th to April 11th.
Seeds
- Portugal Pedro Sousa (first round, retired)
- Australia Marc Polmans (first round)
- Austria Sebastian Ofner (first round)
- Egypt Mohamed Safwat (first round)
- Serbia Danilo Petrović (quarterfinals)
- Slovenia Blaž Rola (champion)
- Belgium Kimmer Coppejans (second round)
- Slovakia Filip Horanský (first round)
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 | ||||||||||||
| Alt | Poland Kacper Żuk | 6 | 3 | 2 | |||||||||
| Q | Slovenia Blaž Kavčič | 2 | 6 | 6 | |||||||||
| Q | Slovenia Blaž Kavčič | 6 | 3 | 2 | |||||||||
| 6 | Slovenia Blaž Rola | 2 | 6 | 6 | |||||||||
| Argentina Andrea Collarini | 63 | 77 | 4 | ||||||||||
| 6 | Slovenia Blaž Rola | 77 | 63 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | Portugal P Sousa | 2r | |||||||||||||||||||||||||
| Alt | Poland K Żuk | 1 | Alt | Poland K Żuk | 6 | 6 | |||||||||||||||||||||
| United Kingdom J Clarke | 61 | 0 | WC | Croatia N Serdarušić | 4 | 2 | |||||||||||||||||||||
| WC | Croatia N Serdarušić | 77 | 6 | Alt | Poland K Żuk | 78 | 6 | ||||||||||||||||||||
| Q | Australia A Santillan | 2 | 0r | PR | Australia T Kokkinakis | 66 | 3 | ||||||||||||||||||||
| SE | Czech Republic Z Kolář | 6 | 5 | SE | Czech Republic Z Kolář | 63 | 1 | ||||||||||||||||||||
| PR | Australia T Kokkinakis | 3 | 6 | 6 | PR | Australia T Kokkinakis | 77 | 6 | |||||||||||||||||||
| 8 | Slovakia F Horanský | 6 | 4 | 4 | Alt | Poland K Żuk | 6 | 3 | 2 | ||||||||||||||||||
| 4 | Egypt M Safwat | 3 | 3 | Q | Slovenia B Kavčič | 2 | 6 | 6 | |||||||||||||||||||
| Q | Slovenia B Kavčič | 6 | 6 | Q | Slovenia B Kavčič | 4 | 79 | 6 | |||||||||||||||||||
| Sweden E Ymer | 6 | 6 | Sweden E Ymer | 6 | 67 | 4 | |||||||||||||||||||||
| France A Müller | 0 | 4 | Q | Slovenia B Kavčič | 4 | 6 | 6 | ||||||||||||||||||||
| Australia A Vukic | 6 | 6 | Australia A Vukic | 6 | 2 | 2 | |||||||||||||||||||||
| WC | Croatia M Poljičak | 1 | 1 | Australia A Vukic | 2 | 6 | 6 | ||||||||||||||||||||
| Australia B Tomic | 2 | 6 | 3 | 7 | Belgium K Coppejans | 6 | 4 | 4 | |||||||||||||||||||
| 7 | Belgium K Coppejans | 6 | 4 | 6 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | Serbia D Petrović | 6 | 6 | ||||||||||||||||||||||||
| Czech Republic L Rosol | 1 | 3 | 5 | Serbia D Petrović | 6 | 6 | |||||||||||||||||||||
| Portugal J Domingues | 5 | 3 | Germany M Marterer | 1 | 3 | ||||||||||||||||||||||
| Germany M Marterer | 7 | 6 | 5 | Serbia D Petrović | 2 | 3 | |||||||||||||||||||||
| Australia A Bolt | 4 | 2 | Argentina A Collarini | 6 | 6 | ||||||||||||||||||||||
| Q | Belarus U Ignatik | 6 | 6 | Q | Belarus U Ignatik | 6 | 2 | 1 | |||||||||||||||||||
| Argentina A Collarini | 6 | 6 | Argentina A Collarini | 2 | 6 | 6 | |||||||||||||||||||||
| 3 | Austria S Ofner | 4 | 4 | Argentina A Collarini | 63 | 77 | 4 | ||||||||||||||||||||
| 6 | Slovenia B Rola | 6 | 6 | 6 | Slovenia B Rola | 77 | 63 | 6 | |||||||||||||||||||
| Kazakhstan D Popko | 3 | 4 | 6 | Slovenia B Rola | 6 | 7 | |||||||||||||||||||||
| WC | Croatia D Ajduković | 2 | 6 | 7 | WC | Croatia D Ajduković | 1 | 5 | |||||||||||||||||||
| PR | Germany D Brown | 6 | 4 | 5 | 6 | Slovenia B Rola | 6 | 6 | |||||||||||||||||||
| Q | Bosnia and Herzegovina M Bašić | 77 | 6 | Q | Bosnia and Herzegovina M Bašić | 2 | 4 | ||||||||||||||||||||
| Turkey C İlkel | 64 | 3 | Q | Bosnia and Herzegovina M Bašić | 77 | 6 | |||||||||||||||||||||
| Netherlands R Haase | 6 | 4 | 77 | Netherlands R Haase | 64 | 3 | |||||||||||||||||||||
| 2 | Australia M Polmans | 3 | 6 | 64 |