Stadium: Court 5 Round: 44 Ground: Clay
| ITF M25 Ricany | 2021/08/29 08:00 | Antonin Stepanek v Jasza Szajrych | 6-4,7-5 |
| ITF M15 Bratislava | 2021/08/24 08:00 | Antonin Stepanek v Lukas H Lilleengen | 6-0,4-6,3-10 |
| ITF M15 Gdynia | 2021/08/08 08:30 | Dominik Nazaruk v Antonin Stepanek | 6-4,6-4 |
| ITF M25 Most | 2021/05/23 15:00 | Antonin Stepanek v Antonin Bolardt | 2-6,4-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 07:30 | Titouan Droguet v Antonin Stepanek | 6-3,6-2 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Daniel Paty v Antonin Stepanek | 2-6,3-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 07:30 | Adam Januska v Antonin Stepanek | 1-6,2-6 |
| ITF M25 Praha | 2021/05/09 12:30 | Antonin Stepanek v Yann Wojcik | 6-4,4-6,4-10 |
| ITF M25 Poznan | 2021/08/24 14:00 | Ivan Kazakov v Michal Mikula | 1-6,2-6 |
| 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 Antalya | 2021/06/27 06:30 | Ivan Kazakov v Stefanos Sakellaridis | 1-6,4-6 |
| ITF M15 Antalya | 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 |