| UTR Pro Tennis Series Nis | 2021/10/08 14:15 | Petar Teodorovic v Denys Klok | 7-5,6-0 |
| UTR Pro Tennis Series Nis | 2021/10/07 07:00 | Egor Novikov v Denys Klok | 6-4,6-3 |
| UTR Pro Tennis Series Nis | 2021/10/05 07:30 | Aleksandar Ljubojevic v Denys Klok | 6-3,3-6,0-6 |
| UTR Pro Tennis Series Nis | 2021/10/04 07:00 | Denys Klok v Andrey Chepelev | 3-6,1-6 |
| UTR Pro Tennis Series Nis | 2021/10/08 17:00 | Duje Kekez v Lazar Radenkovic | 6-1,5-1 |
| UTR Pro Tennis Series Nis | 2021/10/07 08:30 | Ivan Denisov v Lazar Radenkovic | 6-0,6-1 |
| UTR Pro Tennis Series Nis | 2021/10/06 10:00 | Petar Pjevcevic v Lazar Radenkovic | 4-6,6-3,6-2 |
| UTR Pro Tennis Series Nis | 2021/10/04 08:30 | Vladimir Popov v Lazar Radenkovic | 6-1,5-2 |