Stadium: Court 1 Round: 62 Ground: Clay
| ITF M15 Sozopol | 2021/10/15 10:00 | Ben Patael v Simeon Terziev | 6-4,6-2 |
| ITF M15 Sozopol | 2021/10/14 15:10 | Simeon Terziev v Alexander Donski | 6-4,6-4 |
| ITF M15 Sozopol | 2021/10/13 14:00 | George Tsivadze v Simeon Terziev | 2-6,0-2 |
| ITF M15 Sozopol | 2021/10/05 10:00 | Simeon Terziev v Billy Harris | 1-6,5-7 |
| ITF M15 Sozopol | 2021/09/16 08:00 | Valentin Vacherot v Simeon Terziev | 6-0,6-3 |
| ITF M15 Sozopol | 2021/09/14 10:00 | Simeon Terziev v Dinko Dinev | 6-4,6-2 |
| UTR Pro Tennis Series Sofia | 2021/09/02 10:00 | Simeon Terziev v Yurii Dzhavakian | 3-6,7-6,3-6 |
| UTR Pro Tennis Series Sofia | 2021/09/01 06:30 | Simeon Terziev v Adriano Dzhenev | 6-1,6-2 |
| ITF M15 Heraklion | 2021/11/29 08:00 | Evangelos Kypriotis v Tomas Lanik | 6-1,2-6,10-5 |
| ITF M15 Heraklion | 2021/11/28 11:30 | Guy Dagan v Tomas Lanik | 7-6,5-7,5-10 |
| ITF M15 Heraklion | 2021/11/21 07:00 | Blake Ellis v Tomas Lanik | 6-2,2-6,10-2 |
| ITF M15 Sozopol | 2021/10/10 14:30 | Tomas Lanik v Hazem Naw | 2-6,2-6 |
| ITF M25 Prague | 2021/10/04 08:00 | Filip Duda v Tomas Lanik | 3-6,6-4,10-3 |
| ITF M25 Prague | 2021/10/03 08:00 | Tomas Lanik v Jiri Barnat | 7-6,6-3 |
| ITF M25 Pardubice | 2021/09/22 09:00 | Tomas Lanik v Matthew William Donald | 2-6,2-6 |
| ITF M25 Pardubice | 2021/09/21 09:45 | Oscar Galimardanov v Tomas Lanik | 2-6,7-6,8-10 |