Stadium: Court 5 Round: 44 Ground: Clay
| ITF M25 Ricany | 2021/08/29 08:00 | Stepanek, Antonin v Jasza Szajrych | 6-4,7-5 |
| ITF M15 Bratislava | 2021/08/24 08:00 | Stepanek, Antonin v Lukas H Lilleengen | 6-0,4-6,3-10 |
| ITF M15 Gdynia | 2021/08/08 08:30 | Nazaruk, Dominik v Stepanek, Antonin | 6-4,6-4 |
| ITF M25 Most | 2021/05/23 15:00 | Stepanek, Antonin v Bolardt, Antonin | 2-6,4-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/18 07:30 | Titouan Droguet v Stepanek, Antonin | 6-3,6-2 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Daniel Paty v Stepanek, Antonin | 2-6,3-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 07:30 | Januska, Adam v Stepanek, Antonin | 1-6,2-6 |
| ITF M25 Prague | 2021/05/09 12:30 | Stepanek, Antonin v Wojcik, Yann | 6-4,4-6,4-10 |
| ITF M25 Poznan | 2021/08/24 14:00 | Ivan Kazakov v Mikula, Michal | 1-6,2-6 |
| ITF M25 Poznan | 2021/08/24 08:00 | Ivan Kazakov v Peters, Flemming | 2-6,7-5,10-3 |
| ITF M25 Poznan | 2021/08/22 08:00 | Weightman, Oscar v Ivan Kazakov | 6-3,2-6,1-10 |
| ITF M15 Warmbad-Villach | 2021/08/16 07:00 | Ivan Kazakov v Achondo, Gonzalo | 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 Nashatyrkin, Roman | 6-1,6-1 |