| UTR Pro Tennis Series - Sofía | 2021/09/01 09:30 | Yurii Dzhavakian v Alexander Lazov | 7-6,7-6 |
| UTR Pro Tennis Series - Sofía | 2021/08/31 09:30 | Milen Ianakiev v Alexander Lazov | 6-7,2-6 |
| UTR Pro Tennis Series - Sofía | 2021/08/30 11:30 | Julien De Cuyper v Alexander Lazov | 2-6,2-5 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/17 07:30 | Alexander Lazov v Yanais Laurent | 6-3,2-6,4-4 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/16 10:30 | Arthus De La Bassetiere v Alexander Lazov | 6-4,1-6,3-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/15 06:00 | Yurii Dzhavakian v Alexander Lazov | 1-6,2-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/13 07:30 | Petr Nesterov v Alexander Lazov | 6-4,5-3 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/12 10:30 | Alexander Lazov v Valentin Vanta | 7-6,2-6,4-6 |
| UTR Pro Tennis Series - Sofía | 2021/09/02 07:00 | Martin Dimitrov v Dian Nedev | 3-6,3-5 |
| UTR Pro Tennis Series - Sofía | 2021/09/01 08:00 | Dian Nedev v Alexandar Lazarov | 1-6,4-6 |
| UTR Pro Tennis Series - Sofía | 2021/08/31 08:00 | Dian Nedev v Ivailo Keremedchiev | 6-4,5-2 |
| UTR Pro Tennis Series - Sofía | 2021/08/30 08:30 | Plamen Milushev v Dian Nedev | 4-6,2-5 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/17 07:30 | Aleksandr Braynin v Dian Nedev | 6-3,6-2 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/15 10:30 | Dian Nedev v Ilya Snitari | 4-6,6-4,1-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/14 06:00 | Dian Nedev v Iliyan Radulov | 7-5,6-1 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/13 09:00 | Dian Nedev v Denislav Prodanov | 6-7,4-5 |