Stadium: Court 5 Round: 25 Ground: Clay
| ITF - M15 Antalya | 2021/06/21 07:00 | Stefan Palosi v Simeon Terziev | 6-0,7-5 |
| ITF - M15 Antalya | 2021/06/20 07:00 | Simeon Terziev v Gabriel Roveri Sidney | 4-6,7-6,10-8 |
| ITF - M15 Skopje | 2021/06/06 12:00 | Max Houkes v Simeon Terziev | 6-1,6-4 |
| 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 |
| ITF - M15 Novomoskovsk | 2021/06/03 13:20 | Carlos Sanchez Jover v Yurii Dzhavakian | 4-6,6-7 |
| ITF - M15 Novomoskovsk | 2021/05/29 06:15 | Carlos Sanchez Jover v Oleksii Krutykh | 4-6,3-6 |
| ITF - M15 Novomoskovsk | 2021/05/28 07:15 | Ivan Nedelko v Carlos Sanchez Jover | 4-6,3-6 |
| ITF - M15 Novomoskovsk | 2021/05/27 10:20 | Yurii Dzhavakian v Carlos Sanchez Jover | 5-7,0-6 |
| ITF - M15 Novomoskovsk | 2021/05/26 10:05 | Aliaksandr Liaonenka v Carlos Sanchez Jover | 6-4,1-6,5-7 |
| ITF - M15 Cairo | 2021/05/07 08:00 | Jose Fco. Vidal Azorin v Carlos Sanchez Jover | 6-3,6-4 |
| ITF - M15 Cairo | 2021/05/06 07:55 | Mariano Navone v Carlos Sanchez Jover | 7-6,3-6,3-6 |
| ITF - M15 Cairo | 2021/05/05 13:20 | Jack Pinnington Jones v Carlos Sanchez Jover | 3-6,7-6,2-6 |