| UTR Pro Tennis Series - Bělehrad | 2021/07/08 10:30 | Aleksa Mardjonovic v Yaraslav Shyla | 4-6,0-6 |
| UTR Pro Tennis Series - Bělehrad | 2021/07/07 12:00 | Jean Thirouin v Aleksa Mardjonovic | 6-4,6-2 |
| UTR Pro Tennis Series - Bělehrad | 2021/07/06 07:30 | Stefan Latinov v Aleksa Mardjonovic | 3-6,1-6 |
| ITF M25 Bělehrad | 2021/06/28 07:00 | Quentin Folliot v Aleksa Mardjonovic | 6-3,7-5 |
| ITF M25 Bělehrad | 2021/06/27 09:00 | Valentin Vanta v Aleksa Mardjonovic | 5-7,3-6 |
| ITF M15 Skopje | 2021/05/31 11:00 | Luigi Sorrentino v Aleksa Mardjonovic | 6-0,6-4 |
| ITF M15 Brčko | 2021/05/16 07:00 | Yann Wojcik v Aleksa Mardjonovic | 6-2,6-2 |
| UTR Pro Tennis Series - Bělehrad | 2021/07/08 10:30 | Jean Thirouin v Viktor Jovic | 6-2,6-4 |
| UTR Pro Tennis Series - Bělehrad | 2021/07/07 12:00 | Stefan Latinov v Viktor Jovic | 7-5,4-6,3-6 |
| UTR Pro Tennis Series - Bělehrad | 2021/07/05 09:00 | Yaraslav Shyla v Viktor Jovic | 3-6,6-3,4-6 |
| ITF M25 Bělehrad | 2021/06/29 09:15 | Rrezart Cungu v Viktor Jovic | 6-1,6-1 |
| ITF M25 Bělehrad | 2021/06/28 07:00 | Viktor Jovic v Bekkhan Atlangeriev | 6-4,6-4 |
| ITF M25 Bělehrad | 2021/06/27 07:00 | Viktor Jovic v Aleksa Pisaric | 7-6,6-3 |
| ITF M15 Skopje | 2021/06/08 07:30 | Plamen Milushev v Viktor Jovic | 6-4,7-6 |
| ITF M15 Skopje | 2021/06/07 09:30 | Stevan Popovic v Viktor Jovic | 0-6,0-6 |