| ITF M25 Říčany | 2021/08/30 09:00 | Marcelo Zormann v Krystof Zapsky | 6-2,6-3 |
| ITF M25 Říčany | 2021/08/29 10:30 | Lars Aregger v Krystof Zapsky | 6-7,2-6 |
| ITF M15 Lodž | 2021/08/16 08:00 | Kamil Gajewski v Krystof Zapsky | 6-3,6-3 |
| Challenger Praha | 2021/08/08 08:30 | Franco Agamenone v Krystof Zapsky | 6-2,6-3 |
| ITF M25 Vratislav | 2021/06/27 14:00 | Toby Alex Kodat v Krystof Zapsky | 6-0,6-2 |
| ITF M25 Most | 2021/05/23 14:00 | Krystof Zapsky v Daniel Siniakov | 4-6,3-6 |
| ITF M25 Jablonec Nad Nisou | 2021/05/16 10:00 | Krystof Zapsky v Filip Duda | 6-4,3-6,9-11 |
| ITF M25 Praha | 2021/05/09 11:00 | Krystof Zapsky v Peter Goldsteiner | 3-6,4-6 |
| ITF M25 Říčany | 2021/09/01 09:20 | Jiri Barnat v Martin Krumich | 2-6,3-6 |
| ITF M15 Bratislava | 2021/08/25 08:00 | Palaphoom Kovapitukted v Jiri Barnat | 6-3,6-7,6-1 |
| 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 | 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 |