| UTR Pro Tennis Series Ricany | 2021/09/08 12:00 | Jan Kuncik v Yurii Dzhavakian | 2-4 |
| UTR Pro Tennis Series Ricany | 2021/09/07 09:00 | Jan Kuncik v Dominik Suc | 0-6,1-4 |
| UTR Pro Tennis Series Ricany | 2021/09/06 10:00 | Filip Duda v Jan Kuncik | 6-1,5-1 |
| UTR Pro Tennis Series Ricany | 2021/09/09 07:30 | Dominik Suc v Stefanos Sakellaridis | 5-7,6-7 |
| UTR Pro Tennis Series Ricany | 2021/09/07 09:00 | Filip Duda v Stefanos Sakellaridis | 4-6,6-4,5-2 |
| 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 |