Stadium: Court 03 Round: 27 Ground: Clay
| ITF M15 Warmbad-Villach | 2021/08/18 09:40 | Alexander Weis v Philip Bachmaier | 6-1,7-5 |
| ITF M25 Bolzano | 2021/08/07 09:00 | Matteo Arnaldi v Alexander Weis | 6-0,6-1 |
| ITF M25 Bolzano | 2021/08/06 10:25 | Federico Arnaboldi v Alexander Weis | 7-5,1-6,1-6 |
| ITF M25 Bolzano | 2021/08/05 10:25 | Alexander Weis v Andrea Gola | 6-2,6-0 |
| ITF M25 Bolzano | 2021/08/04 08:35 | Riccardo Balzerani v Alexander Weis | 3-6,3-6 |
| ITF M25 Bolzano | 2021/08/03 08:30 | Alexander Weis v Daniel Dutra Da Silva | 7-6,7-6 |
| ITF M15 Esch/Alzette | 2021/07/22 10:00 | Gabriel Alejandro Hidalgo v Alexander Weis | 6-2,6-7,7-5 |
| ITF M15 Esch/Alzette | 2021/07/21 09:00 | Jeffrey Von Der Schulenburg v Alexander Weis | 4-6,4-6 |
| ITF M15 Warmbad-Villach | 2021/08/19 10:15 | Jakob Aichhorn v Neil Oberleitner | 6-1,4-6,6-4 |
| ITF M15 Warmbad-Villach | 2021/08/18 11:05 | Jakob Aichhorn v Ignacio Carou | 6-4,6-4 |
| ITF M15 Warmbad-Villach | 2021/08/15 07:00 | Jakob Aichhorn v Lukas Rohseano | 6-0,6-0 |
| ITF M25 Telfs | 2021/07/13 09:40 | Jakob Aichhorn v Daniel Paty | 4-6,3-6 |
| ITF M25 Telfs | 2021/07/12 09:10 | Jakob Aichhorn v Julius Ratt | 6-4,7-6 |
| Challenger Salzburg | 2021/07/06 15:00 | Jakob Aichhorn v Jiri Lehecka | 4-6,3-6 |
| ITF M15 Anif | 2020/08/26 10:00 | Jakob Aichhorn v Enrico Dalla Valle | 2-6,2-6 |
| ITF M25 Vogau | 2020/08/16 12:00 | Igor Sijsling v Jakob Aichhorn | 6-1,6-1 |