Stadium: Court 1 Round: 25 Ground: Carpet indoor
| ITF M15 Opava | 2021/11/15 12:10 | Ondrej Valek v Vojtech Vlkovsky | 6-4,6-4 |
| ITF M15 Opava | 2021/11/14 12:30 | Mark Havlicek v Ondrej Valek | 7-6,6-7,5-10 |
| ITF M25 Ricany | 2021/08/30 08:00 | Ondrej Valek v Noel Larwig | 4-6,2-6 |
| ITF M25 Prostejov | 2021/08/16 09:50 | Nico Hornitschek v Ondrej Valek | 6-1,6-2 |
| ITF M25 Prostejov | 2021/08/15 09:00 | Vojtech Vlkovsky v Ondrej Valek | 6-4,4-6,9-11 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Peter Goldsteiner v Ondrej Valek | 6-2,6-2 |
| ITF M15 Poprad | 2021/07/04 08:00 | Samuel Puskar v Ondrej Valek | 7-5,6-1 |
| ITF M25 Most | 2021/05/25 08:00 | Ondrej Valek v Sean Cuenin | 2-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/11/03 13:00 | Saba Purtseladze v Ondrej Horak | 6-2,4-6,6-2 |
| ITF M15 Sharm El Sheikh | 2021/11/02 07:30 | Leonid Sheyngezikht v Ondrej Horak | 7-6,1-6,9-11 |
| ITF M15 Sharm El Sheikh | 2021/11/01 09:00 | Mohab Hamed v Ondrej Horak | 2-6,2-6 |
| ITF M15 Sharm El Sheikh | 2021/10/31 11:30 | Eirik Groener v Ondrej Horak | 4-6,4-6 |
| ITF M15 Sharm El Sheikh | 2021/10/24 08:00 | Ondrej Horak v Nikoloz Davlianidze | 6-1,6-7,8-10 |
| ITF M15 Sharm El Sheikh | 2021/10/20 10:15 | Marek Gengel v Ondrej Horak | 6-0,6-2 |
| ITF M15 Sharm El Sheikh | 2021/10/19 07:25 | Sergei Pogosian v Ondrej Horak | 4-6,6-2,10-3 |
| ITF M15 Sharm El Sheikh | 2021/10/18 08:00 | Pavlos Parson v Ondrej Horak | 3-6,6-1,9-11 |