Stadium: Court 1 Round: 26 Ground: Clay
| ITF M25 Velenje | 2021/07/07 10:05 | Bor Artnak v Domagoj Biljesko | 6-4,1-6,6-2 |
| ITF M25 Velenje | 2021/07/06 08:00 | Domagoj Biljesko v Nicolas Parizzia | 6-3,7-5 |
| ITF M25 Velenje | 2021/07/05 09:00 | Domagoj Biljesko v Tadija Radovanovic | 6-4,4-6,11-9 |
| ITF M15 Sarajevo | 2021/06/03 10:30 | Domagoj Biljesko v Hernan Casanova | 2-6,3-6 |
| ITF M15 Sarajevo | 2021/06/02 15:55 | Zsombor Velcz v Domagoj Biljesko | 7-6,2-6,5-7 |
| ITF M15 Sarajevo | 2021/06/01 09:00 | Domagoj Biljesko v Michele Vianello | 6-3,6-4 |
| ITF M15 Sarajevo | 2021/05/31 12:00 | Domagoj Biljesko v Stevan Popovic | 6-1,6-2 |
| ITF M25 Kiseljak | 2021/05/26 10:00 | Domagoj Biljesko v Tim Heger | 6-7,6-2,3-6 |
| Challenger Iasi | 2021/07/11 08:50 | Bogdan Bobrov v Oleg Prihodko | 6-4,7-6 |
| ITF M15 Sofia | 2021/07/08 07:00 | Oleg Prihodko v Francisco Comesana | 2-6,4-6 |
| ITF M15 Sofia | 2021/07/06 09:10 | Oleg Prihodko v Jaimee Floyd Angele | 3-6,7-5,6-4 |
| ITF M15 Antalya | 2021/06/30 09:40 | Oleg Prihodko v Fletcher Scott | 5-7,5-7 |
| ITF M15 Antalya | 2021/06/23 08:40 | Oleg Prihodko v Mariano Kestelboim | 7-5,3-6,2-6 |
| ITF M15 Antalya | 2021/06/15 10:45 | Oleg Prihodko v Savva Polukhin | 6-3,2-6,6-10 |
| ITF M15 Antalya | 2021/06/14 07:30 | Oleg Prihodko v Michalis Sakellaridis | 6-0,6-4 |
| ITF M15 Antalya | 2021/06/13 07:30 | Oleg Prihodko v Aleksandar Tomas | 6-2,6-2 |