Stadium: Court 1 Round: 25 Ground: Clay
| ITF M15 Bad Waltersdorf | 2021/08/31 07:00 | Domagoj Biljesko v Hasan Ibrahim | 6-2,6-0 |
| ITF M15 Novi Sad | 2021/08/06 09:00 | Domagoj Biljesko v Francisco Comesana | 2-6,5-7 |
| ITF M15 Novi Sad | 2021/08/04 07:55 | Domagoj Biljesko v Aziz Ouakaa | 5-7,6-1,6-3 |
| ITF M15 Novi Sad | 2021/08/03 08:00 | Domagoj Biljesko v Millen Hurrion | 7-5,6-2 |
| ITF M15 Novi Sad | 2021/08/02 08:00 | Domagoj Biljesko v Petar Jovanovic | 6-3,6-1 |
| ITF M15 Novi Sad | 2021/08/01 12:15 | Domagoj Biljesko v Kristijan Juhas | 7-5,6-4 |
| ITF M15 Novi Sad | 2021/07/25 09:30 | Lazar Milicevic v Domagoj Biljesko | 6-2,6-3 |
| ITF M15 Doboj | 2021/07/14 13:10 | Dusan Obradovic v Domagoj Biljesko | 7-5,6-2 |
| ITF M15 Bad Waltersdorf | 2021/08/26 09:05 | David Pichler v Timo Stodder | 1-6,1-6 |
| ITF M15 Bad Waltersdorf | 2021/08/25 08:50 | David Pichler v Benedikt Emesz | 6-2,6-4 |
| ITF M15 Bratislava | 2021/08/20 10:00 | David Pichler v Peter Fajta | 4-6,5-7 |
| ITF M15 Bratislava | 2021/08/19 12:20 | David Pichler v Andrew Paulson | 2-6,6-3,6-2 |
| ITF M15 Bratislava | 2021/08/17 10:30 | David Pichler v Mariano Navone | 4-6,6-3,6-4 |
| ITF M25 Wetzlar | 2021/08/07 11:00 | David Pichler v Peter Heller | 3-6,7-5,3-6 |
| ITF M25 Wetzlar | 2021/08/06 10:55 | David Pichler v Henri Squire | 4-6,6-4,6-4 |
| ITF M25 Wetzlar | 2021/08/05 10:40 | David Pichler v Daniel Cukierman | 6-2,6-4 |