| UTR Pro Tennis Series - Pazardzhik | 2021/07/16 06:00 | Vasil Kirkov v Yanaki Milev | 6-1,6-1 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/14 07:30 | Vasil Kirkov v Aleksandr Braynin | 7-5,5-1 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/13 10:30 | Vasil Kirkov v Gorazd Srbljak | 2-6,6-3,1-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/12 06:00 | Vladimir Popov v Vasil Kirkov | 2-6,4-6 |
| ITF M15 Sofía | 2021/07/06 11:05 | Francisco Comesana v Vasil Kirkov | 6-3,6-2 |
| ITF M15 Champaign | 2021/06/23 19:10 | Vasil Kirkov v Kyle Seelig | 6-4,3-6,6-7 |
| ITF M25 Tulsa | 2021/06/15 14:00 | Vasil Kirkov v Michael Shabaz | 3-6,6-1,7-10 |
| ITF M25 Tulsa | 2021/06/14 15:00 | Vasil Kirkov v Errol Smith | 6-4,6-4 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/16 09:00 | Adriano Dzhenev v Yanais Laurent | 6-0,6-1 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/14 10:30 | Adriano Dzhenev v Dmitrii Vasilev | 6-1,7-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/13 06:00 | Adriano Dzhenev v Olexiy Kolisnyk | 1-6,2-6 |
| UTR Pro Tennis Series - Pazardzhik | 2021/07/12 09:00 | Anthony Genov v Adriano Dzhenev | 4-6,6-6 |