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