Stadium: Court 3 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Sharm El Sheikh | 2021/10/21 08:00 | Lukas Krainer v David Poljak | 3-6,6-4,6-2 |
| ITF M15 Sharm El Sheikh | 2021/10/20 11:25 | Arjun Mahadevan v David Poljak | 1-6,1-6 |
| ITF M25 Prague | 2021/10/10 08:25 | Khumoyun Sultanov v David Poljak | 6-2,3-6,6-4 |
| ITF M25 Prague | 2021/10/09 08:30 | Tobias Simon v David Poljak | 6-7,4-6 |
| ITF M25 Prague | 2021/10/08 09:00 | David Poljak v Sanjar Fayziev | 6-4,6-2 |
| ITF M25 Prague | 2021/10/07 11:55 | David Poljak v Pavel Nejedly | 6-3,3-6,6-2 |
| ITF M25 Prague | 2021/10/06 15:20 | David Poljak v Leopold Zima | 6-4,6-1 |
| Challenger Sibiu | 2021/09/26 07:30 | Yan Bondarevskiy v David Poljak | 7-5,3-6,6-3 |
| ITF M25 Nur-Sultan | 2021/10/27 04:55 | Filip Peliwo v Nikita Sidorov | 6-1,7-6 |
| ITF M25 Nur-Sultan | 2021/10/18 05:05 | Igor Trunov v Nikita Sidorov | 6-2,6-7,11-9 |
| ITF M15 Shymkent | 2021/04/14 07:00 | Nikita Sidorov v Jurabek Karimov | 2-6,0-6 |
| ITF M15 Shymkent | 2021/04/05 05:00 | Mark Tryakshin v Nikita Sidorov | 7-6,6-4 |
| ITF M15 Nur-Sultan | 2021/02/08 06:00 | Nikita Sidorov v Oscar Weightman | 2-6,4-6 |
| ITF M15 Nur-Sultan | 2021/02/01 07:30 | Aleksandre Bakshi v Nikita Sidorov | 3-6,7-5,10-3 |