| UTR Pro Tennis Series - Říčany | 2021/09/06 10:00 | Filip Duda v Jan Kuncik | 6-1,5-1 |
| ITF - M25 Říčany | 2021/09/02 07:55 | Filip Duda v Marek Gengel | 3-6,3-6 |
| ITF - M25 Říčany | 2021/09/01 10:05 | Noel Larwig v Filip Duda | 2-6,2-6 |
| ITF - M15 - Antalya | 2021/06/22 07:00 | Vladimir Korolev v Filip Duda | 6-3,2-6,10-4 |
| ITF - M15 - Antalya | 2021/06/21 11:35 | Dian Nedev v Filip Duda | 4-6,2-6 |
| ITF - M15 - Antalya | 2021/06/20 07:00 | Kaya Arinc v Filip Duda | 0-6,4-6 |
| ITF - M15 - Antalya | 2021/06/15 07:30 | Tadeas Paroulek v Filip Duda | 6-2,6-4 |
| ITF - M15 - Antalya | 2021/06/14 13:45 | Daiki Yoshimura v Filip Duda | 3-6,6-7 |
| 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 |