Stadium: Court 1 Round: 54 Ground: Clay
| 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 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/13 12:50 | Stanek, Robin v Stepanek, Antonin | 4-6,6-2,6-4 |
| Milovice, Singles M-ITF-CZE-10A | 2019/11/12 09:00 | Novikov, Egor v Stepanek, Antonin | 2-6,4-6 |
| ITF M15 Bratislava | 2021/08/23 09:00 | Jancovic, Patrik v Lukas H Lilleengen | 0-6,2-6 |
| ITF M15 Bratislava | 2021/08/17 08:00 | Zsombor Velcz v Lukas H Lilleengen | 7-5,6-2 |
| ITF M15 Bratislava | 2021/08/16 12:00 | Mammetgulyyev, Isa v Lukas H Lilleengen | 3-6,1-6 |
| ITF M15 Frederiksberg | 2021/08/01 08:00 | Lukas H Lilleengen v Yunis, Facundo | 6-3,1-6,5-10 |
| ITF M15 Vejle | 2021/07/25 07:00 | Lukas H Lilleengen v Overbeck, Carl Emil | 2-6,6-4,7-10 |
| ITF M15 Perugia | 2021/07/18 12:45 | Lukas H Lilleengen v Frinzi, Mattia | 3-6,3-6 |
| ITF M25 Montauban | 2021/06/21 13:00 | Verdier, Thibault v Lukas H Lilleengen | 6-7,6-2,10-8 |
| ITF - M25 Grasse | 2021/06/14 16:15 | Briand, Jurgen v Lukas H Lilleengen | 6-1,7-6 |