Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Falun | 2021/10/01 14:30 | Vasil Kirkov v Shintaro Imai | 2-6,5-7 |
| ITF M25 Falun | 2021/09/30 14:20 | Antoine Escoffier v Vasil Kirkov | 6-3,4-6,4-6 |
| ITF M25 Falun | 2021/09/29 15:20 | Vasil Kirkov v Leopold Zima | 6-4,6-4 |
| ITF M25 Falun | 2021/09/27 12:00 | Sergey Fomin v Vasil Kirkov | 3-6,2-6 |
| ITF M25 Plaisir | 2021/09/17 11:30 | Thomas Laurent v Vasil Kirkov | 6-7,1-6 |
| ITF M25 Plaisir | 2021/09/16 07:55 | Vasil Kirkov v Marvin Moeller | 2-6,7-6,7-6 |
| ITF M25 Plaisir | 2021/09/14 10:35 | Vasil Kirkov v Melvin Manuel | 6-4,6-2 |
| Challenger Banja Luka | 2021/09/05 10:50 | Vasil Kirkov v Mircea-Alexandru Jecan | 4-6,4-6 |
| ITF M25 Most | 2021/05/24 08:00 | Martin Damm v Adam Januska | 6-0,6-1 |
| ITF M25 Most | 2021/05/23 08:00 | Adam Januska v Vitek Horak | 6-3,6-4 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 07:30 | Adam Januska v Antonin Stepanek | 1-6,2-6 |