| UTR Pro Tennis Series Nis | 2021/10/10 08:00 | Christos Keisidis v Vladimir Popov | 6-1,5-2 |
| UTR Pro Tennis Series Nis | 2021/10/09 13:15 | Aleksandar Ljubojevic v Vladimir Popov | 4-6,5-7 |
| 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 |
| ITF M15 Girona | 2021/10/17 10:30 | Michalis Sakellaridis v Gerard Oltra Guiral | 7-5,6-4 |
| ITF M15 Platja D'Aro | 2021/10/11 08:30 | Michalis Sakellaridis v Lorenzo Joaquin Rodriguez | 1-6,2-6 |
| UTR Pro Tennis Series Zadar | 2021/10/03 11:00 | Borna Devald v Michalis Sakellaridis | 6-3,7-5 |
| UTR Pro Tennis Series Zadar | 2021/10/02 13:00 | Filip Maric v Michalis Sakellaridis | 2-6,2-5 |
| UTR Pro Tennis Series Zadar | 2021/10/01 09:30 | Deni Zmak v Michalis Sakellaridis | 6-2,7-5 |
| UTR Pro Tennis Series Zadar | 2021/09/30 12:00 | Ivan Liutarevich v Michalis Sakellaridis | 6-7,5-6 |
| UTR Pro Tennis Series Zadar | 2021/09/29 15:00 | Maxim Krapivin v Michalis Sakellaridis | 2-6,2-6 |
| UTR Pro Tennis Series Zadar | 2021/09/27 11:00 | Ivan Denisov v Michalis Sakellaridis | 6-2,5-1 |