Stadium: Court 3 Round: 62 Ground: Clay
| ITF M25 Nur-Sultan | 2021/10/28 07:05 | Petr Bar Biryukov v Bogdan Bobrov | 6-7,3-6 |
| ITF M25 Nur-Sultan | 2021/10/27 08:05 | Egor Agafonov v Petr Bar Biryukov | 4-6,3-6 |
| ITF M25 Nur-Sultan | 2021/10/25 04:55 | Petr Bar Biryukov v Yerassyl Murat | 6-1,6-4 |
| ITF M25 Nur-Sultan | 2021/10/21 05:00 | Filip Peliwo v Petr Bar Biryukov | 3-6,7-5,6-3 |
| ITF M25 Nur-Sultan | 2021/10/20 07:50 | Yan Sabanin v Petr Bar Biryukov | 4-6,6-7 |
| ITF M25 Nur-Sultan | 2021/10/18 09:00 | Petr Bar Biryukov v Mykyta Riepkin | 6-2,6-3 |
| ITF M15 Kazan | 2021/10/13 10:05 | Ivan Liutarevich v Petr Bar Biryukov | 2-6,7-5,6-1 |
| ITF M15 Telavi | 2021/08/02 08:00 | Petr Bar Biryukov v Giorgi Javakhishvili | 7-6,4-6,9-11 |
| ITF M15 Antalya | 2021/11/21 06:30 | Marko Pavicic v Maksim Maslov | 2-6,6-4,10-6 |