Stadium: Court 3 Round: 27 Ground: Hardcourt outdoor
| ITF M25 Nur-Sultan | 2021/07/08 05:00 | Petr Bar Biryukov v Vladyslav Manafov | 3-6,6-2,6-3 |
| ITF M25 Nur-Sultan | 2021/07/07 07:00 | Kirill Kolganov v Petr Bar Biryukov | 2-6,1-6 |
| 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 M25 Nur-Sultan | 2021/07/08 04:55 | Beibit Zhukayev v Jason Kubler | 1-6,7-6,7-5 |
| ITF M25 Nur-Sultan | 2021/07/07 04:00 | Beibit Zhukayev v Sergey Fomin | 7-6,7-6 |
| Challenger Almaty | 2021/06/14 05:30 | Beibit Zhukayev v Mohamed Safwat | 4-6,4-6 |
| Challenger Almaty | 2021/06/08 04:00 | Andrej Martin v Beibit Zhukayev | 6-2,6-1 |
| ITF M15 Shymkent | 2021/06/05 05:00 | Edoardo Lavagno v Beibit Zhukayev | 7-6,7-6 |
| ITF M15 Shymkent | 2021/06/04 07:00 | Vladyslav Manafov v Beibit Zhukayev | 4-6,2-6 |
| ITF M15 Shymkent | 2021/06/03 10:20 | Beibit Zhukayev v Louroi Martinez | 7-6,6-3 |
| ITF M15 Shymkent | 2021/06/02 05:00 | Ivan Denisov v Beibit Zhukayev | 2-6,2-6 |