Stadium: Centre Round: 44 Ground: Clay
| ITF M25 Jablonec Nad Nisou | 2021/05/16 08:30 | George Loffhagen v Ondrej Horak | 5-7,1-6 |
| ITF M25 Prague | 2021/05/10 08:00 | Jan Satral v Ondrej Horak | 6-1,6-2 |
| ITF M25 Prague | 2021/05/09 10:00 | Ondrej Horak v Jan Jermar | 7-6,6-3 |
| ITF M15 Sibenik | 2021/04/20 08:00 | Alen Rogic-Hadzalic v Ondrej Horak | 6-1,6-4 |
| ITF M15 Sibenik | 2021/04/19 12:15 | Ondrej Horak v Boris Butulija | 6-2,7-6 |
| ITF M15 Sharm El Sheikh | 2021/03/24 11:20 | Ondrej Horak v Paul Jubb | 2-6,0-6 |
| ITF M15 Sharm El Sheikh | 2021/03/15 07:30 | Niels Visker v Ondrej Horak | 6-7,7-6,13-11 |
| ITF M25 Prague | 2021/05/09 10:00 | Adam Pavlasek v Tomas Papik | 6-2,6-7,10-1 |
| ITF M25 Meerbusch | 2021/04/11 13:00 | Tomas Papik v Karlo Cubelic | 3-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/03/21 09:30 | Tomas Papik v Christian Sigsgaard | 4-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/03/17 14:40 | Marek Gengel v Tomas Papik | 7-5,6-1 |
| ITF M15 Sharm El Sheikh | 2021/03/08 13:00 | Tomas Papik v Illya Beloborodko | 6-7,3-6 |
| ITF M15 Sharm El Sheikh | 2021/03/07 16:00 | Giuseppe La Vela v Tomas Papik | 5-7,6-4,3-10 |
| ITF M15 Sharm El Sheikh | 2020/11/09 08:00 | Miljan Zekic v Tomas Papik | 6-1,6-1 |
| ITF M15 Sharm El Sheikh | 2020/11/08 07:00 | Tomas Papik v Dylan Salton | 6-4,6-3 |