Stadium: Court 3 Round: 44 Ground: Clay
| ITF M15 Bratislava | 2021/08/24 08:00 | Jiri Barnat v Jakub Kroslak | 6-3,7-5 |
| ITF M15 Bratislava | 2021/08/23 09:00 | Jakub Kroslak v Iiro Vasa | 6-1,6-3 |
| ITF M25 Prostejov | 2021/08/16 08:00 | Dominique Graf v Jakub Kroslak | 6-2,6-4 |
| ITF M25 Prostejov | 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 |