Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 - Telfs | 2021/07/12 07:50 | Neil Oberleitner v Jan Jermar | 6-3,6-0 |
| ITF M15 - Sibenik | 2021/04/19 08:00 | Christian Sigsgaard v Neil Oberleitner | 7-6,6-4 |
| ITF M15 - Sibenik | 2021/04/18 08:00 | Matic Dimic v Neil Oberleitner | 7-6,4-6,6-10 |
| ITF M15 - Sharm El Sheikh | 2021/04/06 08:55 | Neil Oberleitner v Adam Jones | 2-6,6-1,8-10 |
| ITF M15 - Sharm El Sheikh | 2021/04/05 11:30 | Neil Oberleitner v Emiliano Troche | 6-0,6-1 |
| ITF M15 - Sharm El Sheikh | 2021/03/28 14:30 | Lorenzo Rottoli v Neil Oberleitner | 6-1,3-6,10-8 |
| ITF M15 - Sharm El Sheikh | 2021/03/23 07:30 | Francesco Vilardo v Neil Oberleitner | 6-2,6-4 |
| ITF M15 - Sharm El Sheikh | 2021/03/22 07:30 | Zura Tkemaladze v Neil Oberleitner | 4-6,6-2,5-10 |
| ITF M25 - Telfs | 2021/07/12 07:55 | Ondrej Horak v Samuel Puskar | 6-3,6-4 |
| ITF M25 - Wroclaw | 2021/06/28 10:00 | Daniel Dutra Da Silva v Ondrej Horak | 3-6,0-6 |
| ITF M15 - Skopje | 2021/06/07 08:30 | Leonid Sheyngezikht v Ondrej Horak | 6-0,7-5 |
| ITF M15 - Skopje | 2021/06/06 09:00 | Ondrej Horak v Luigi Sorrentino | 6-0,1-6,11-9 |
| ITF M15 - Skopje | 2021/05/30 09:30 | Ondrej Horak v Viktor Jovic | 4-6,3-6 |
| ITF M25 - Most | 2021/05/23 14:00 | Martin Damm v Ondrej Horak | 7-5,6-4 |
| ITF M25 - Jablonec Nad Nisou | 2021/05/17 07:30 | Ondrej Horak v Tomas Papik | 1-6,4-6 |
| ITF M25 - Jablonec Nad Nisou | 2021/05/16 08:30 | George Loffhagen v Ondrej Horak | 5-7,1-6 |