Stadium: Court 11 Round: 25 Ground: Clay
| ITF M15 Shymkent | 2021/06/01 09:20 | Antonio Campo v Petr Bar Biryukov | 4-6,6-3,10-7 |
| ITF M15 Shymkent | 2021/05/31 06:35 | Alexey Dubinin v Petr Bar Biryukov | 2-6,2-6 |
| ITF M15 Shymkent | 2021/05/24 04:00 | Louroi Martinez v Petr Bar Biryukov | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/15 09:00 | Evgeny Tyurnev v Petr Bar Biryukov | 6-1,6-1 |
| ITF M15 St Petersburg | 2021/04/13 09:00 | Petr Bar Biryukov v Kirill Saplin | 6-4,6-1 |
| ITF M15 St Petersburg | 2021/04/06 09:00 | Ivan Nedelko v Petr Bar Biryukov | 6-3,6-1 |
| ITF M15 St Petersburg | 2021/02/11 11:10 | Evgeny Tyurnev v Petr Bar Biryukov | 6-2,7-5 |
| ITF M15 St Petersburg | 2021/02/09 07:00 | Petr Bar Biryukov v Aleksei Abazov | 6-3,6-0 |
| ITF M15 Shymkent | 2021/05/28 05:00 | Yan Bondarevskiy v Edoardo Lavagno | 3-6,4-6 |
| ITF M15 Shymkent | 2021/05/27 06:30 | Yan Bondarevskiy v Mikhail Fufygin | 6-1,6-1 |
| ITF M15 Shymkent | 2021/05/26 06:40 | Tsung-Hua Yang v Yan Bondarevskiy | 4-6,3-6 |
| ITF M25 Vic | 2021/05/22 10:00 | Yan Bondarevskiy v Pedro Cachin | 2-6,6-7 |
| ITF M25 Vic | 2021/05/21 10:55 | Yan Bondarevskiy v Roberto Ortega-Olmedo | 6-3,6-3 |
| ITF M25 Vic | 2021/05/20 13:10 | Yan Bondarevskiy v Benjamin Winter Lopez | 6-3,4-6,6-4 |
| ITF M25 Vic | 2021/05/19 09:00 | Jesper De Jong v Yan Bondarevskiy | 7-6,4-6,4-6 |
| ITF M25 Vic | 2021/05/18 08:00 | Mateus Alves v Yan Bondarevskiy | 6-7,3-6 |