Stadion: Court 3 Round: 62 Ground: Clay
| ITF - M15 - Bad Waltersdorf | 2021/08/27 08:00 | Alen Rogic-Hadzalic v Gabriel Decamps | 2-6,6-7 |
| ITF - M15 - Bad Waltersdorf | 2021/08/26 11:45 | Matic Spec v Alen Rogic-Hadzalic | 2-6,4-6 |
| ITF - M15 - Bad Waltersdorf | 2021/08/25 11:45 | Gergely Madarasz v Alen Rogic-Hadzalic | 2-6,3-6 |
| ITF - M15 - Bad Waltersdorf | 2021/08/23 15:50 | Alen Rogic-Hadzalic v Philip Bachmaier | 6-3,7-5 |
| ITF - M15 - Bad Waltersdorf | 2021/08/22 07:00 | Alen Rogic-Hadzalic v Tino Kovacic | 6-2,6-3 |
| ITF - M15 - Novi Sad | 2021/08/02 12:30 | Alen Rogic-Hadzalic v Alex Knaff | 2-6,1-6 |
| ITF - M15 - Novi Sad | 2021/07/27 07:30 | Roman Andres Burruchaga v Alen Rogic-Hadzalic | 7-6,6-2 |
| ITF - M15 - Novi Sad | 2021/07/26 09:00 | Pavle Daljev v Alen Rogic-Hadzalic | 4-6,6-7 |
| ITF - M15 - Bad Waltersdorf | 2021/08/30 09:00 | Niklas Waldner v Lukas Rohseano | 7-6,7-5 |
| ITF - M15 - Warmbad-Villach | 2021/08/15 15:30 | Niklas Waldner v Rafael Kis Balazs | 4-6,5-7 |
| ITF - M25 - Bozen | 2021/08/02 11:50 | Filippo Moroni v Niklas Waldner | 6-2,6-2 |
| ITF - M25 - Kottingbrunn | 2021/07/20 12:10 | Niklas Waldner v David Poljak | 7-6,2-6,6-7 |
| ITF - M25 - Telfs | 2021/07/11 09:00 | Jakub Katuch v Niklas Waldner | 1-6,3-6 |
| 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 |