Estádio: Court 4 Round: 44 Ground: Clay
| ITF - M25 Poznan | 2021/08/24 08:00 | Ivan Kazakov v Flemming Peters | 2-6,7-5,10-3 |
| ITF - M25 Poznan | 2021/08/22 08:00 | Oscar Weightman v Ivan Kazakov | 6-3,2-6,1-10 |
| ITF - M15 Warmbad-Villach | 2021/08/16 07:00 | Ivan Kazakov v Gonzalo Achondo | 6-3,0-6,8-10 |
| ITF - M15 Antália | 2021/06/27 06:30 | Ivan Kazakov v Stefanos Sakellaridis | 1-6,4-6 |
| ITF - M15 Antália | 2021/06/20 07:00 | Ivan Kazakov v Ray Ho | 2-6,1-6 |
| ITF - M15 Tbilisi | 2021/05/18 05:30 | Aleksandr Braynin v Ivan Kazakov | 6-2,6-2 |
| ITF - M15 Tbilisi | 2021/05/17 05:30 | Ivan Kazakov v Roman Nashatyrkin | 6-1,6-1 |
| ITF - M15 Tbilisi | 2021/05/16 06:00 | Egor Baklanov v Ivan Kazakov | 6-7,6-3,1-10 |
| ITF - M25 Poznan | 2021/08/22 08:00 | Lars Aregger v Michal Mikula | 1-6,0-6 |
| ITF - M15 Łódź | 2021/08/18 08:00 | Valerio Aboian v Michal Mikula | 6-4,6-3 |
| ITF - M15 Gdynia | 2021/08/10 12:30 | Filip Peliwo v Michal Mikula | 6-3,7-5 |
| ITF - M15 Parnu | 2021/08/05 11:20 | Michal Mikula v Otto Virtanen | 3-6,6-3,2-6 |
| ITF - M15 Parnu | 2021/08/04 12:30 | Michal Mikula v Petro Orlando Fellin | 6-2,6-0 |
| ITF - M15 Parnu | 2021/08/03 08:30 | Michal Mikula v Bartosz Wojnar | 6-0,6-3 |
| Polónia - Tour Nacional | 2021/07/14 11:50 | Michal Mikula v Kacper Zuk | 3-6,2-6 |
| Polónia - Tour Nacional | 2021/07/13 09:15 | Filip Peliwo v Michal Mikula | 4-6,3-6 |