| UTR Pro Tennis Series Pazardzhik | 2021/04/01 07:00 | Yurii Dzhavakian v Simeon Terziev | 4-6,4-5 |
| UTR Pro Tennis Series Sofia | 2021/09/01 06:30 | Simeon Terziev v Adriano Dzhenev | 6-1,6-2 |
| UTR Pro Tennis Series Sofia | 2021/08/31 11:00 | Simeon Terziev v Veselin Kiselkov | 6-1,5-0 |
| UTR Pro Tennis Series Sofia | 2021/08/30 10:00 | Ioan Alexandru Chirita v Simeon Terziev | 4-6,6-3,3-6 |
| ITF M25 Pitesti | 2021/08/04 05:55 | Corentin Denolly v Simeon Terziev | 6-3,7-5 |
| ITF M25 Pitesti | 2021/08/03 05:55 | Toby Martin v Simeon Terziev | 5-7,4-6 |
| ITF M15 Sofia | 2021/07/08 11:40 | Simeon Terziev v Gabriel Donev | 1-6,6-4,0-6 |
| ITF M15 Sofia | 2021/07/07 08:35 | Dan Added v Simeon Terziev | 7-5,5-7,4-6 |
| ITF M15 Antalya | 2021/06/30 10:30 | Simeon Terziev v Carlos Sanchez Jover | 6-2,0-6,6-7 |
| UTR Pro Tennis Series Sofia | 2021/09/01 09:30 | Yurii Dzhavakian v Alexander Lazov | 7-6,7-6 |
| UTR Pro Tennis Series Sofia | 2021/08/31 09:30 | Yurii Dzhavakian v Julien De Cuyper | 6-0,5-0 |
| UTR Pro Tennis Series Sofia | 2021/08/30 08:30 | Milen Ianakiev v Yurii Dzhavakian | 4-6,2-6 |
| ITF M15 Telavi | 2021/08/03 04:30 | Alessandro Ingarao v Yurii Dzhavakian | 6-2,6-2 |
| ITF M25 Telavi | 2021/07/27 09:30 | Yurii Dzhavakian v Evgeny Philippov | 4-6,6-4,5-7 |
| UTR Pro Tennis Series Pazardzhik | 2021/07/17 09:00 | Yurii Dzhavakian v Yanaki Milev | 4-6,2-6 |
| UTR Pro Tennis Series Pazardzhik | 2021/07/16 10:30 | Yurii Dzhavakian v Valentin Vanta | 5-7,3-6 |
| UTR Pro Tennis Series Pazardzhik | 2021/07/15 06:00 | Yurii Dzhavakian v Alexander Lazov | 1-6,2-6 |