Stadium: Court 4 Round: 54 Ground: Clay
| ITF M15 Bratislava | 2021/08/23 09:00 | Jiri Barnat v Radovan Michalik | 7-5,6-0 |
| ITF M15 Bratislava | 2021/08/18 09:30 | Jiri Barnat v Fabian Marozsan | 4-6,2-6 |
| ITF M15 Bratislava | 2021/08/17 08:00 | Eric Morris v Jiri Barnat | 4-6,6-7 |
| ITF M25 Praha | 2021/05/10 09:00 | Adam Pavlásek v Jiri Barnat | 6-3,4-6,14-12 |
| ITF M25 Praha | 2021/05/09 10:00 | Victor Vlad Cornea v Jiri Barnat | 5-7,6-3,9-11 |
| ITF M15 Sharm El Sheikh | 2021/02/07 13:00 | Chien Hsun Lo v Jiri Barnat | 6-3,6-2 |
| ITF M15 Sharm El Sheikh | 2021/01/31 07:00 | Francesco Passaro v Jiri Barnat | 6-2,6-3 |
| ITF M25 Jablonec Nad Nisou | 2020/09/20 09:00 | Jiri Barnat v Dominik Kellovsky | 5-7,3-6 |
| ITF M15 Bratislava | 2021/08/23 09:00 | Jakub Kroslak v Iiro Vasa | 6-1,6-3 |
| ITF M25 Prostějov | 2021/08/16 08:00 | Dominique Graf v Jakub Kroslak | 6-2,6-4 |
| ITF M25 Prostějov | 2021/08/15 08:00 | Lars Aregger v Jakub Kroslak | 2-6,2-6 |
| ITF M25 Kottingbrunn | 2021/07/19 10:35 | Jakub Kroslak v Peter Makk | 4-6,6-3,6-10 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Roman Postolka v Jakub Kroslak | 4-6,3-6 |
| ITF M15 Poprad | 2021/07/04 11:00 | Jakub Kroslak v Mateusz Terczynski | 6-2,6-7,9-11 |
| ITF M15 Monastir | 2021/03/28 09:00 | Aleksandr Kalinin v Jakub Kroslak | 7-5,7-6 |
| ITF M15 Monastir | 2021/03/22 10:00 | Jakub Kroslak v Aristotelis Thanos | 4-6,2-6 |