| ITF M25 Prostejov | 2021/08/15 10:00 | Dominique Graf v Roman Postolka | 6-3,5-7,10-7 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 15:15 | Philip Bachmaier v Roman Postolka | 6-2,6-3 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 12:20 | Jan Jermar v Roman Postolka | 2-6,0-6 |
| 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 |