Stadium: Court 6 Round: 26 Ground: Hardcourt indoor
| ITF M15 St Petersburg | 2021/04/07 11:15 | Sarp Agabigun v Aleksei Abazov | 6-0,6-0 |
| ITF M15 St Petersburg | 2021/04/05 06:55 | Sarp Agabigun v Igor Trunov | 6-0,6-2 |
| ITF M15 St Petersburg | 2021/04/04 09:50 | Sarp Agabigun v Klim Kozyrev | 6-3,6-0 |
| ITF M15 Antalya | 2021/03/16 07:00 | Sarp Agabigun v Edoardo Lavagno | 4-6,7-5,8-10 |
| ITF M15 Antalya | 2021/03/15 08:30 | Sarp Agabigun v Vladislav Gorbatenko | 6-1,6-4 |
| ITF M15 Antalya | 2021/03/14 07:00 | Sarp Agabigun v Carlo Alberto Fossati | 7-5,6-4 |
| ITF M15 Antalya | 2021/03/11 07:00 | Matheus Almeida v Sarp Agabigun | 0-0 |
| ITF M15 Antalya | 2021/03/11 06:55 | Matheus Pucinelli De Almeida v Sarp Agabigun | 7-6,6-4 |
| ITF M15 St Petersburg | 2021/04/07 07:00 | Naoki Tajima v Alexey Zakharov | 3-6,6-1,3-6 |
| ITF M15 Kazan | 2021/03/13 08:00 | Alexey Zakharov v Alibek Kachmazov | 7-5,6-3 |
| ITF M15 Kazan | 2021/03/12 09:05 | Alexey Zakharov v Alexandr Binda | 6-2,7-6 |
| ITF M15 Kazan | 2021/03/11 08:00 | Alexey Zakharov v Yaraslav Shyla | 6-3,6-2 |
| ITF M15 Kazan | 2021/03/09 12:15 | Alexey Zakharov v Igor Kudriashov | 4-6,6-2,6-3 |
| Challenger St. Petersburg | 2021/02/28 09:20 | Alessandro Bega v Alexey Zakharov | 6-4,6-2 |
| Challenger Nur-Sultan | 2021/02/22 04:00 | Pavel Kotov v Alexey Zakharov | 7-5,1-6,6-3 |
| Challenger Nur-Sultan | 2021/02/21 07:05 | Grigoriy Lomakin v Alexey Zakharov | 2-6,3-6 |