Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 Most | 2021/05/24 09:00 | Niklas Waldner v Edward Hubner | 4-6,3-6 |
| 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 Iiro Vasa | 1-6,4-6 |
| ITF M15 Anif | 2020/08/23 07:00 | Davide Galoppini v Niklas Waldner | 6-3,6-4 |
| ITF M25 Vogau | 2020/08/17 11:30 | Niklas Waldner v Alexander Shevchenko | 4-6,2-6 |
| ITF M25 Vogau | 2020/08/17 07:30 | Dean Thurner v Niklas Waldner | 4-6,6-2,5-10 |