| Prostejov, Singles M-ITF-CZE-04A | 2021/08/15 10:00 | Dominique Graf v Postolka, Roman | 6-3,5-7,10-7 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 15:15 | Bachmaier, Philip v Postolka, Roman | 6-2,6-3 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/02 12:20 | Jan Jermar v Postolka, Roman | 2-6,0-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/01 17:05 | Postolka, Roman v Borkowski, Mikolaj | 6-1,6-0 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Postolka, Roman v Jakub Kroslak | 4-6,3-6 |
| ITF M25 Telfs | 2021/07/12 09:40 | Heger, Tim v Postolka, Roman | 7-5,6-3 |
| ITF M25 Most | 2021/05/24 09:00 | Postolka, Roman v Recek, Dominik | 3-6,7-6,6-10 |
| ITF M25 Most | 2021/05/23 14:00 | Stepan Pecak v Postolka, Roman | 4-6,1-6 |