2021 Split Open II – Singles
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Blaž Rola was the defending champion but chose not to defend his title.
Kacper Żuk won the title after defeating Mathias Bourgue 6–4, 6–2 in the final.
Seeds
- France Grégoire Barrère (first round)
- Australia Marc Polmans (first round)
- France Hugo Gaston (second round)
- Egypt Mohamed Safwat (first round)
- Belgium Kimmer Coppejans (first round)
- Italy Lorenzo Giustino (first round)
- Slovakia Filip Horanský (second round)
- Canada Steven Diez (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 | ||||||||||||
| France Quentin Halys | 68 | 0r | |||||||||||
| France Mathias Bourgue | 710 | 0 | |||||||||||
| France Mathias Bourgue | 4 | 2 | |||||||||||
| Q | Poland Kacper Żuk | 6 | 6 | ||||||||||
| Sweden Elias Ymer | 77 | 0 | 1 | ||||||||||
| Q | Poland Kacper Żuk | 65 | 6 | 6 |
Top half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | France G Barrère | 3 | 3 | ||||||||||||||||||||||||
| SE | Argentina P Cachin | 6 | 6 | SE | Argentina P Cachin | 2 | 62 | ||||||||||||||||||||
| Germany D Masur | 3 | 2 | France Q Halys | 6 | 77 | ||||||||||||||||||||||
| France Q Halys | 6 | 6 | France Q Halys | 6 | 77 | ||||||||||||||||||||||
| PR | Australia T Kokkinakis | 6 | 5 | 6 | PR | Australia T Kokkinakis | 3 | 62 | |||||||||||||||||||
| WC | Croatia D Ajduković | 4 | 7 | 3 | PR | Australia T Kokkinakis | 6 | 6 | |||||||||||||||||||
| PR | Germany D Brown | 5 | 2 | 7 | Slovakia F Horanský | 1 | 2 | ||||||||||||||||||||
| 7 | Slovakia F Horanský | 7 | 6 | France Q Halys | 68 | 0r | |||||||||||||||||||||
| 4 | Egypt M Safwat | 6 | 2 | 4 | France M Bourgue | 710 | 0 | ||||||||||||||||||||
| France M Bourgue | 3 | 6 | 6 | France M Bourgue | 6 | 6 | |||||||||||||||||||||
| Australia A Bolt | 1 | 3 | Portugal J Domingues | 3 | 4 | ||||||||||||||||||||||
| Portugal J Domingues | 6 | 6 | France M Bourgue | 6 | 1 | 7 | |||||||||||||||||||||
| Q | Bosnia and Herzegovina M Bašić | 6 | 6 | Q | Bosnia and Herzegovina M Bašić | 4 | 6 | 5 | |||||||||||||||||||
| Uzbekistan D Istomin | 3 | 1 | Q | Bosnia and Herzegovina M Bašić | 6 | 6 | |||||||||||||||||||||
| LL | Argentina A Collarini | 6 | 6 | LL | Argentina A Collarini | 4 | 4 | ||||||||||||||||||||
| 6 | Italy L Giustino | 4 | 4 |
Bottom half
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | Belgium K Coppejans | 3 | 4 | ||||||||||||||||||||||||
| WC | Croatia N Serdarušić | 6 | 6 | WC | Croatia N Serdarušić | 62 | 7 | 3 | |||||||||||||||||||
| France A Müller | 5 | 4 | Sweden E Ymer | 77 | 5 | 6 | |||||||||||||||||||||
| Sweden E Ymer | 7 | 6 | Sweden E Ymer | 6 | 6 | ||||||||||||||||||||||
| Turkey C İlkel | 6 | 77 | Turkey C İlkel | 3 | 4 | ||||||||||||||||||||||
| France E Couacaud | 2 | 64 | Turkey C İlkel | 2 | 6 | 79 | |||||||||||||||||||||
| Q | Slovakia L Klein | 3 | 6 | 3 | 3 | France H Gaston | 6 | 3 | 67 | ||||||||||||||||||
| 3 | France H Gaston | 6 | 3 | 6 | Sweden E Ymer | 77 | 0 | 1 | |||||||||||||||||||
| 8 | Canada S Diez | 3 | 5 | Q | Poland K Żuk | 65 | 6 | 6 | |||||||||||||||||||
| Germany M Marterer | 6 | 7 | Germany M Marterer | 4 | 64 | ||||||||||||||||||||||
| Q | Poland K Żuk | 6 | 77 | Q | Poland K Żuk | 6 | 77 | ||||||||||||||||||||
| Czech Republic L Rosol | 4 | 64 | Q | Poland K Żuk | 6 | 6 | |||||||||||||||||||||
| WC | Croatia Duje Kekez | 2 | 64 | Australia A Vukic | 4 | 1 | |||||||||||||||||||||
| Australia A Vukic | 6 | 77 | Australia A Vukic | 77 | 6 | ||||||||||||||||||||||
| Q | Czech Republic Z Kolář | 6 | 6 | Q | Czech Republic Z Kolář | 65 | 4 | ||||||||||||||||||||
| 2 | Australia M Polmans | 2 | 2 |