Stadium: Court 2 Round: 25 Ground: Clay
| ITF M15 Gdynia | 2021/08/10 08:00 | Petr Hajek v Filip Pieczonka | 5-7,4-6 |
| ITF M15 Gdynia | 2021/08/09 10:30 | Petr Hajek v Simonas Zukauskas | 6-0,6-1 |
| ITF M15 Heraklion | 2021/06/06 07:30 | Petr Hajek v Ioannis Papounidis | 4-6,7-5,6-10 |
| ITF M15 Heraklion | 2021/05/31 06:30 | Petr Hajek v Toby D. Boyer | 4-6,7-6,6-10 |
| ITF M15 Heraklion | 2021/05/30 09:00 | Petr Hajek v Areg Stepanian | 7-5,6-2 |
| ITF M15 Heraklion | 2021/05/23 10:00 | Petr Hajek v Menelaos Efstathiou | 3-6,2-6 |
| ITF M15 Heraklion | 2021/05/17 07:00 | Petr Hajek v Evangelos Kypriotis | 6-4,0-6,8-10 |
| ITF M15 Sibenik | 2021/04/20 09:15 | Petr Hajek v Marino Jakic | 6-4,4-6,1-10 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/05 08:35 | Maks Kasnikowski v Zsombor Piros | 4-6,7-6,6-7 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/04 15:00 | Svyatoslav Ilnytskyy v Maks Kasnikowski | 2-6,3-6 |
| Challenger Poznan | 2021/07/25 13:00 | Maks Kasnikowski v Christopher Heyman | 3-6,4-6 |
| Polen - National Tour | 2021/07/15 09:15 | Kamil Majchrzak v Maks Kasnikowski | 6-4,6-2 |
| Polen - National Tour | 2021/07/14 10:30 | Aleksander Orlikowski v Maks Kasnikowski | 7-6,3-6,1-6 |
| Polen - National Tour | 2021/07/13 09:15 | Maks Kasnikowski v Pawel Juszczak | 7-6,7-6 |
| ITF M15 Monastir | 2021/04/01 08:30 | Sho Shimabukuro v Maks Kasnikowski | 6-4,5-7,7-6 |
| ITF M15 Monastir | 2021/03/30 10:30 | Aziz Ouakaa v Maks Kasnikowski | 0-6,1-6 |