Stadium: Court 2 Round: 25 Ground: Hardcourt outdoor
| Challenger Istanbul | 2021/09/13 09:00 | Sarp Agabigun v Hugo Grenier | 4-6,6-3,4-6 |
| ITF M25 Trier | 2021/08/24 13:30 | Kai Wehnelt v Sarp Agabigun | 6-0,6-4 |
| ITF M15 Antalya | 2021/06/01 10:20 | Nicolas Moreno De Alboran v Sarp Agabigun | 6-4,6-4 |
| ITF M15 Tbilisi | 2021/05/20 06:00 | Sarp Agabigun v Justin Roberts | 4-6,6-2,6-7 |
| ITF M15 Tbilisi | 2021/05/18 07:00 | Andrey Chepelev v Sarp Agabigun | 2-6,4-6 |
| ITF M15 St Petersburg | 2021/04/16 09:30 | Yanki Erel v Sarp Agabigun | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/15 10:25 | Sarp Agabigun v Konstantin Kravchuk | 5-7,6-2,6-3 |
| ITF M15 St Petersburg | 2021/04/13 09:00 | Timur Kiyamov v Sarp Agabigun | 6-7,4-6 |
| ITF M15 Sozopol | 2021/09/15 08:30 | George Lazarov v Gabriel Donev | 6-1,6-3 |
| ITF M15 Ulcinj | 2021/09/10 09:00 | Gabriel Donev v Edoardo Lavagno | 1-6,2-6 |
| ITF M15 Ulcinj | 2021/09/09 09:50 | Aziz Kijametovic v Gabriel Donev | 5-7,6-7 |
| ITF M15 Ulcinj | 2021/09/08 08:00 | Gabriel Donev v Dusan Rajic | 6-4,6-7,7-5 |
| ITF M15 Ulcinj | 2021/09/03 08:55 | Gabriel Donev v Ignacio Carou | 4-6,3-6 |
| ITF M15 Ulcinj | 2021/09/02 08:30 | Gorazd Srbljak v Gabriel Donev | 1-6,6-7 |
| ITF M15 Telavi | 2021/08/04 08:45 | Evgeny Philippov v Gabriel Donev | 2-6,3-6 |
| ITF M15 Telavi | 2021/08/03 09:45 | Martin Borisiouk v Gabriel Donev | 3-6,2-6 |