| UTR Pro Tennis Series Pazardzhik | 2021/04/01 12:00 | Martin Dimitrov v Alexander Lazov | 0-6,1-6 |
| ITF M15 Sozopol | 2021/10/11 09:00 | Tommaso Compagnucci v Martin Dimitrov | 6-4,6-2 |
| ITF M15 Sozopol | 2021/10/10 10:30 | Martin Dimitrov v Dragos Petre Popeanga | 6-3,6-4 |
| ITF M15 Sozopol | 2021/10/06 09:35 | Martin Dimitrov v Alexander Cozbinov | 1-6,3-6 |
| ITF M15 Sozopol | 2021/10/05 06:30 | Vlad Stoica v Martin Dimitrov | 1-6,2-6 |
| ITF M15 Sozopol | 2021/10/04 07:00 | Suleyman Deniz Gursoy v Martin Dimitrov | 2-6,1-6 |
| ITF M15 Sozopol | 2021/09/15 07:00 | Martin Dimitrov v Calin Manda | 4-6,4-6 |
| ITF M15 Sozopol | 2021/09/13 07:00 | Martin Dimitrov v Radoslav Shandarov | 6-7,6-2,14-12 |
| UTR Pro Tennis Series Sofia | 2021/09/02 07:00 | Martin Dimitrov v Dian Nedev | 3-6,3-5 |
| UTR Pro Tennis Series Nis | 2021/10/10 17:00 | Ivan Liutarevich v Alexander Lazov | 6-4,6-4 |
| UTR Pro Tennis Series Nis | 2021/10/09 10:15 | Alexander Lazov v Duje Kekez | 6-3,3-6,5-1 |
| UTR Pro Tennis Series Nis | 2021/10/08 18:15 | George Botezan v Alexander Lazov | 2-6,3-5 |
| UTR Pro Tennis Series Nis | 2021/10/07 10:00 | Aleksa Mardjonovic v Alexander Lazov | 2-6,4-5 |
| UTR Pro Tennis Series Nis | 2021/10/06 11:30 | Dusan Trunic v Alexander Lazov | 6-4,2-6,1-6 |
| UTR Pro Tennis Series Nis | 2021/10/04 11:30 | Christos Keisidis v Alexander Lazov | 6-3,0-6,3-6 |
| UTR Pro Tennis Series Ricany | 2021/09/18 09:00 | Antonin Bolardt v Alexander Lazov | 4-6,6-4,2-5 |
| UTR Pro Tennis Series Ricany | 2021/09/16 07:00 | Alexander Lazov v Jan Satral | 1-6,2-6 |