| UTR Pro Tennis Series Nis | 2021/10/07 07:00 | Aleksandar Ljubojevic v Andrey Chepelev | 2-6,2-6 |
| UTR Pro Tennis Series Nis | 2021/10/06 07:00 | Aleksandar Ljubojevic v Egor Novikov | 5-7,6-4,6-3 |
| 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 | Aleksandar Ljubojevic v Petar Teodorovic | 4-6,3-6 |
| UTR Pro Tennis Series Nis | 2021/10/08 18:15 | Petar Pjevcevic v Vladimir Popov | 2-6,6-0,5-1 |
| UTR Pro Tennis Series Nis | 2021/10/07 14:00 | Duje Kekez v Vladimir Popov | 6-0,5-1 |
| UTR Pro Tennis Series Nis | 2021/10/05 10:30 | Ivan Denisov v Vladimir Popov | 6-2,5-4 |
| UTR Pro Tennis Series Nis | 2021/10/04 08:30 | Vladimir Popov v Lazar Radenkovic | 6-1,5-2 |
| UTR Pro Tennis Series Sofia | 2021/09/02 07:00 | Vladimir Popov v Christos Keisidis | 7-6,6-7,3-6 |
| UTR Pro Tennis Series Sofia | 2021/09/01 11:00 | Mick Lescure v Vladimir Popov | 1-6,4-6 |
| UTR Pro Tennis Series Sofia | 2021/08/31 11:00 | Mihael Mihaylov v Vladimir Popov | 1-6,3-5 |
| UTR Pro Tennis Series Sofia | 2021/08/30 07:00 | Viktor Markov v Vladimir Popov | 6-3,7-6 |