Stadium: Eden 11 Round: 62 Ground: Clay
| ITF M15 Bad Waltersdorf | 2021/08/31 10:15 | Tomas Lipovsek Puches v Niklas Rohrer | 6-2,7-5 |
| ITF M15 Bad Waltersdorf | 2021/08/23 07:00 | Niklas Rohrer v Fausto Tabacco | 7-6,6-1 |
| ITF M15 Bad Waltersdorf | 2021/08/22 07:00 | Niklas Rohrer v Luca Castagnola | 6-7,6-2,10-7 |
| ITF M15 Warmbad-Villach | 2021/08/17 13:25 | Matteo Donati v Niklas Rohrer | 6-3,6-3 |
| ITF M25 Kottingbrunn | 2021/07/19 11:50 | Calin Manda v Niklas Rohrer | 6-2,6-3 |
| ITF M25 Kottingbrunn | 2021/07/18 07:30 | Simon Habsuda v Niklas Rohrer | 1-6,5-7 |
| ITF M25 Telfs | 2021/07/12 12:05 | Lukas Palovic v Niklas Rohrer | 6-4,6-3 |
| ITF M25 Telfs | 2021/07/11 09:00 | Christian Fellin v Niklas Rohrer | 2-6,3-6 |