Stadium: Court 1 Round: 54 Ground: Clay
| ITF M25 Prague | 2021/10/03 14:00 | Artem Dubrivnyy v Dawid Taczala | 6-4,6-2 |
| Challenger Orleans | 2021/09/26 09:00 | Artem Dubrivnyy v Evgeny Karlovskiy | 2-6,6-7 |
| Challenger Istanbul | 2021/09/12 08:00 | Artem Dubrivnyy v Christopher Heyman | 3-6,2-6 |
| Challenger Liberec | 2021/08/02 09:30 | Alexander Ritschard v Artem Dubrivnyy | 6-2,6-2 |
| Challenger Liberec | 2021/08/01 15:10 | Artem Dubrivnyy v Kyrian Jacquet | 6-4,6-0 |
| Challenger Trieste | 2021/07/25 10:30 | Artem Dubrivnyy v Nerman Fatic | 2-6,1-6 |
| Challenger Nur-Sultan | 2021/07/20 07:20 | Artem Dubrivnyy v Peter Polansky | 5-7,6-7 |
| Challenger Nur-Sultan | 2021/07/19 04:00 | Artem Dubrivnyy v Vladyslav Manafov | 6-2,7-6 |
| ITF M25 Prague | 2021/10/03 10:30 | Matej Galik v Ondrej Horak | 3-6,1-6 |
| ITF M25 Pardubice | 2021/09/20 10:00 | Matyas Cerny v Ondrej Horak | 6-2,3-6,10-6 |
| ITF M25 Ricany | 2021/08/29 08:00 | Ondrej Horak v Lambert Ruland | 1-6,1-6 |
| ITF M15 Bad Waltersdorf | 2021/08/23 09:00 | Ondrej Horak v Alessandro Ragazzi | 3-6,6-4,4-10 |
| ITF M15 Warmbad-Villach | 2021/08/17 08:00 | Philip Bachmaier v Ondrej Horak | 6-2,6-0 |
| ITF M15 Warmbad-Villach | 2021/08/16 12:30 | Leonardo Chiari v Ondrej Horak | 3-6,2-6 |
| ITF M15 Telavi | 2021/08/03 07:25 | Yanki Erel v Ondrej Horak | 6-1,6-4 |
| ITF M25 Telavi | 2021/07/27 07:20 | Ondrej Horak v Alexander Boborykin | 2-6,6-3,5-10 |