| UTR Pro Tennis Series - Zadar | 2021/09/30 12:00 | Deni Zmak v Ivan Denisov | 2-6,6-2,6-5 |
| UTR Pro Tennis Series - Zadar | 2021/09/29 15:00 | Ivan Liutarevich v Deni Zmak | 4-6,6-4,6-6 |
| UTR Pro Tennis Series - Zadar | 2021/09/28 11:00 | Maxim Krapivin v Deni Zmak | 2-6,2-5 |
| UTR - Pro Tennis Series - Portorož | 2021/08/29 08:00 | Olexiy Kolisnyk v Deni Zmak | 4-6,6-2,6-3 |
| UTR - Pro Tennis Series - Portorož | 2021/08/28 07:00 | Egor Novikov v Deni Zmak | 2-6,7-6,1-5 |
| UTR - Pro Tennis Series - Portorož | 2021/08/26 08:30 | Denis Parshutin v Deni Zmak | 3-6,0-6 |
| UTR - Pro Tennis Series - Portorož | 2021/08/25 13:00 | Tilen Zitnik v Deni Zmak | 3-6,1-6 |
| UTR - Pro Tennis Series - Portorož | 2021/08/24 07:00 | Deni Zmak v Timur Maulenov | 7-6,5-1 |
| 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 |
| ITF - M25 Pardubice | 2021/09/19 11:00 | Michalis Sakellaridis v Alan F R Fierros | 6-7,6-4,3-10 |
| UTR Pro Tennis Series - Říčany | 2021/09/18 10:30 | Stefanos Sakellaridis v Michalis Sakellaridis | 6-2,7-6 |
| UTR Pro Tennis Series - Říčany | 2021/09/17 07:30 | Dominik Kellovsky v Michalis Sakellaridis | 6-2,6-3 |
| UTR Pro Tennis Series - Říčany | 2021/09/12 10:30 | Michalis Sakellaridis v Dominik Langmajer | 6-2,5-2 |
| UTR Pro Tennis Series - Říčany | 2021/09/10 07:30 | Michalis Sakellaridis v Andrey Chepelev | 0-6,2-6 |