| UTR Pro Tennis Series Bucharest | 2021/12/04 11:00 | Gabriel Donev v Simon A Ivanov | 6-4,3-6,1-6 |
| UTR Pro Tennis Series Bucharest | 2021/12/03 12:30 | Gabriel Donev v Valentin Vanta | 3-6,1-6 |
| UTR Pro Tennis Series Bucharest | 2021/12/01 09:30 | Gabriel Donev v Volodymyr Uzhylovskyi | 6-0,4-6,5-2 |
| UTR Pro Tennis Series Bucharest | 2021/11/29 12:30 | Jordan Correia v Gabriel Donev | 6-1,6-3 |
| ITF M15 Sozopol | 2021/10/05 13:30 | Sarp Agabigun v Gabriel Donev | 5-7,5-7 |
| ITF M15 Sozopol | 2021/09/15 08:30 | George Lazarov v Gabriel Donev | 6-1,6-3 |
| ITF M15 Ulcinj | 2021/09/10 09:00 | Gabriel Donev v Edoardo Lavagno | 1-6,2-6 |
| ITF M15 Ulcinj | 2021/09/09 09:50 | Aziz Kijametovic v Gabriel Donev | 5-7,6-7 |
| UTR Pro Tennis Series Bucharest | 2021/12/05 08:00 | Jordan Correia v Johann Willems | 2-6,3-6 |
| UTR Pro Tennis Series Bucharest | 2021/12/04 12:30 | Vlad Andrei Dancu v Johann Willems | 7-6,1-6,4-5 |
| UTR Pro Tennis Series Bucharest | 2021/12/03 11:00 | Dan Alexandru Tomescu v Johann Willems | 6-7,6-7 |
| UTR Pro Tennis Series Bucharest | 2021/12/02 08:00 | Dragos Constantin Ignat v Johann Willems | 1-6,2-5 |
| UTR Pro Tennis Series Bucharest | 2021/11/30 12:30 | Stefan Palosi v Johann Willems | 2-6,3-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 15:00 | Johann Willems v Mikhail Minakov | 2-5 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 13:30 | Guy Den Heijer v Johann Willems | 7-6,2-6,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 12:00 | Jip Van Assendelft v Johann Willems | 3-6,2-5 |