Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF M25 - Nur-Sultan | 2021/07/06 07:50 | Ivan Zaytsev v Kirill Kolganov | 6-2,6-2 |
| ITF M25 - Nur-Sultan | 2021/07/05 04:00 | Zhanger Almashev v Kirill Kolganov | 6-7,6-3,12-14 |
| ITF M15 - Shymkent | 2021/04/14 08:45 | Kirill Kolganov v Denis Klok | 4-6,1-6 |
| ITF M15 - Shymkent | 2021/04/06 07:40 | Kirill Kolganov v Danil Ozernoy | 6-7,2-6 |
| ITF M15 - Shymkent | 2021/04/05 06:05 | Sharobiddin Abzalov v Kirill Kolganov | 4-6,0-6 |
| ITF M15 - Nur-Sultan | 2021/02/08 04:00 | Kirill Kolganov v Aliaksandr Liaonenka | 2-6,0-6 |
| ITF M15 - Nur-Sultan | 2021/02/01 05:00 | Giacomo Dambrosi v Kirill Kolganov | 6-1,6-2 |
| ITF M25 - Nur-Sultan | 2021/07/06 05:55 | Petr Bar Biryukov v Danil Ozernoy | 6-3,7-6 |
| ITF M15 - Antalya | 2021/06/27 06:30 | Inigo G Olasagasti v Petr Bar Biryukov | 7-6,1-6,10-5 |
| ITF M15 - Shymkent | 2021/06/02 11:45 | Petr Bar Biryukov v Yan Bondarevskiy | 3-6,2-6 |
| 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 |