| ITF - M15 Bad Waltersdorf | 2021/08/31 07:00 | Luigi Sorrentino v Stefanos Sakellaridis | 6-0,5-7,10-7 |
| ITF - M15 Bad Waltersdorf | 2021/08/22 09:00 | Joshua Peck v Stefanos Sakellaridis | 1-6,6-3,11-9 |
| ITF - M15 Warmbad-Villach | 2021/08/17 07:30 | Lorenzo Vatteroni v Stefanos Sakellaridis | 7-6,6-2 |
| ITF - M15 Warmbad-Villach | 2021/08/16 12:30 | Leon Benedict v Stefanos Sakellaridis | 4-6,3-6 |
| ITF - M15 Novi Sad | 2021/08/01 14:00 | Stefanos Sakellaridis v Lukas Palovic | 4-6,1-6 |
| ITF - M25 Kottingbrunn | 2021/07/18 07:30 | Stefanos Sakellaridis v Samuel Paulovcak | 1-6,4-6 |
| ITF - M15 Sofia | 2021/07/05 07:00 | Stefanos Sakellaridis v Aristotelis Thanos | 2-6,6-7 |
| ITF - M15 Antalya | 2021/06/30 06:30 | Hanwen Li v Stefanos Sakellaridis | 6-1,6-2 |
| UTR Pro Tennis Series - Sofia | 2021/09/04 06:00 | Alexandar Lazarov v Yurii Dzhavakian | 6-3,6-7,5-1 |
| UTR Pro Tennis Series - Sofia | 2021/09/03 08:30 | Yurii Dzhavakian v Matias Zukas | 6-4,6-4 |
| UTR Pro Tennis Series - Sofia | 2021/09/02 10:00 | Simeon Terziev v Yurii Dzhavakian | 3-6,7-6,3-6 |
| UTR Pro Tennis Series - Sofia | 2021/09/01 09:30 | Yurii Dzhavakian v Alexander Lazov | 7-6,7-6 |
| UTR Pro Tennis Series - Sofia | 2021/08/31 09:30 | Yurii Dzhavakian v Julien De Cuyper | 6-0,5-0 |
| UTR Pro Tennis Series - Sofia | 2021/08/30 08:30 | Milen Ianakiev v Yurii Dzhavakian | 4-6,2-6 |
| ITF - M15 Telavi | 2021/08/03 04:30 | Alessandro Ingarao v Yurii Dzhavakian | 6-2,6-2 |
| ITF - M25 Telavi | 2021/07/27 09:30 | Yurii Dzhavakian v Evgeny Philippov | 4-6,6-4,5-7 |