| UTR Pro Tennis Series Sofia | 2021/08/30 10:00 | Ioan Alexandru Chirita v Terziev, Simeon | 4-6,6-3,3-6 |
| ITF M25 Pitesti | 2021/08/04 05:55 | 데놀리, 코렌틴 v Terziev, Simeon | 6-3,7-5 |
| ITF M25 Pitesti | 2021/08/03 05:55 | 마르틴, 토비 v Terziev, Simeon | 5-7,4-6 |
| ITF M15 Sofia | 2021/07/08 11:40 | Terziev, Simeon v 도네브, 가브리엘 | 1-6,6-4,0-6 |
| ITF M15 Sofia | 2021/07/07 08:35 | 다데드, 단 v Terziev, Simeon | 7-5,5-7,4-6 |
| ITF M15 Antalya | 2021/06/30 10:30 | Terziev, Simeon v 산체즈 조벨, 카를로스 | 6-2,0-6,6-7 |
| ITF M15 Antalya | 2021/06/21 07:00 | 팔로시, 스테판 v Terziev, Simeon | 6-0,7-5 |
| ITF M15 Antalya | 2021/06/20 07:00 | Terziev, Simeon v 로베리 시드니, 가브리엘 | 4-6,7-6,10-8 |
| UTR Pro Tennis Series Sofia | 2021/08/30 08:30 | Veselin Kiselkov v Adriano Dzhenev | 3-6,6-1,4-5 |