Stadium: Court 6 Round: 44 Ground: Clay
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 16:05 | Sebastian Usiadek v Jan Jermar | 3-6,3-6 |
| ITF M25 Kottingbrunn | 2021/07/19 13:45 | Jan Jermar v Francisco Vittar | 4-6,5-7 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Laurin Aerne v Jan Jermar | 1-6,2-6 |
| ITF M25 Telfs | 2021/07/12 07:50 | Neil Oberleitner v Jan Jermar | 6-3,6-0 |
| ITF M15 Poprad | 2021/07/07 10:10 | Luca Castelnuovo v Jan Jermar | 7-6,6-2 |
| ITF M25 Most | 2021/05/24 08:00 | Jakub Beran v Jan Jermar | 6-4,6-7,10-3 |
| ITF M25 Jablonec Nad Nisou | 2021/05/17 07:30 | Jan Jermar v Kai Lemstra | 4-6,4-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 08:30 | Jan Jermar v Peter Samosi | 7-6,6-0 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 17:05 | Roman Postolka v Mikolaj Borkowski | 6-1,6-0 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Roman Postolka v Jakub Kroslak | 4-6,3-6 |
| ITF M25 Telfs | 2021/07/12 09:40 | Tim Heger v Roman Postolka | 7-5,6-3 |
| ITF M25 Most | 2021/05/24 09:00 | Roman Postolka v Dominik Recek | 3-6,7-6,6-10 |
| ITF M25 Most | 2021/05/23 14:00 | Stepan Pecak v Roman Postolka | 4-6,1-6 |
| ITF M25 Prague | 2021/05/10 10:30 | Roman Postolka v Petr Michnev | 3-6,2-6 |
| ITF M25 Prague | 2021/05/09 11:00 | Roman Postolka v Daniel Paty | 6-4,1-6,10-7 |
| ITF Slovakia F3 | 2018/08/05 10:00 | Samuel Paulovcak v Roman Postolka | 6-3,6-1 |