| ITF M15 Antalya | 2021/04/26 07:00 | Fabrizio Andaloro v Simeon Terziev | 4-6,6-4,11-9 |
| ITF M15 Antalya | 2021/04/25 07:00 | Credit Chaiyarin v Simeon Terziev | 3-6,1-6 |
| ITF M15 Antalya | 2021/04/18 07:00 | Kristof Minarik v Simeon Terziev | 6-1,6-1 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/03 10:00 | Jules Marie v Simeon Terziev | 6-3,6-0 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/02 07:00 | Ilya Snitari v Simeon Terziev | 6-0,6-3 |
| UTR Pro Tennis Series Pazardzhik | 2021/04/01 07:00 | Yurii Dzhavakian v Simeon Terziev | 4-6,4-5 |
| UTR Pro Tennis Series Pazardzhik | 2021/03/29 09:00 | Simeon Terziev v Gergely Madarasz | 3-6,1-6 |
| ITF M15 Antalya | 2021/03/08 10:00 | Stefan Palosi v Simeon Terziev | 6-3,6-0 |