Stadium: Court 6 Round: 62 Ground: Clay
| ITF M25 Most | 2021/05/23 08:00 | Niklas Waldner v Milos Karol | 3-6,7-5,10-3 |
| ITF - M15 Monastir | 2021/05/09 11:00 | Taisei Ichikawa v Niklas Waldner | 6-1,6-0 |
| ITF - M15 Monastir | 2021/05/02 12:00 | Andrea Picchione v Niklas Waldner | 6-2,6-4 |
| ITF - M15 Monastir | 2021/04/25 11:30 | Niklas Waldner v Vasa, Iiro | 1-6,4-6 |
| ITF M15 Anif | 2020/08/23 07:00 | Galoppini, Davide v Niklas Waldner | 6-3,6-4 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/17 11:30 | Niklas Waldner v Alexander Shevchenko | 4-6,2-6 |
| Vogau, Singles Qualifying M-ITF-AUT-04A | 2020/08/17 07:30 | Thurner, Dean v Niklas Waldner | 4-6,6-2,5-10 |
| Austrian Tennis Championship | 2020/07/28 12:00 | Lucas Miedler v Niklas Waldner | 6-3,6-2 |
| ITF M25 Most | 2021/05/23 14:00 | Martin Benes v Hubner, Edward | 4-6,4-6 |
| ITF - M15 Antalya | 2021/04/11 07:00 | Gusev, Daniil v Hubner, Edward | 4-6,7-6,5-10 |
| ITF - M15 Antalya | 2021/04/06 07:00 | Vernier, Michel v Hubner, Edward | 5-7,6-0,12-10 |
| ITF - M15 Antalya | 2021/04/05 07:00 | Hubner, Edward v Taiyo Yamanaka | 6-7,6-2,10-5 |
| ITF - M15 Antalya | 2021/04/04 06:30 | Hubner, Edward v Daniil Savelev | 6-1,6-1 |
| ITF - M15 Antalya | 2021/03/28 06:30 | Hubner, Edward v Alexis Boureau | 7-5,6-3 |
| ITF M15 Bratislava | 2021/03/10 09:00 | Hubner, Edward v Peter Fajta | 7-6,4-6,2-6 |
| ITF M15 Bratislava | 2021/03/09 12:00 | Piotr Grynkowski v Hubner, Edward | 2-6,2-6 |