Stadium: Court 03 Round: 28 Ground: Clay
| ITF M15 Warmbad-Villach | 2021/08/20 10:10 | Alexander Weis v Jakob Aichhorn | 6-1,0-6,6-2 |
| 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 Warmbad-Villach | 2021/08/20 10:55 | Sebastian Prechtel v Matteo Donati | 3-6,6-4,3-6 |
| ITF M15 Warmbad-Villach | 2021/08/19 12:55 | Matteo Donati v Franco Ribero | 6-1,6-1 |
| ITF M15 Warmbad-Villach | 2021/08/17 13:25 | Matteo Donati v Niklas Rohrer | 6-3,6-3 |
| Challenger San Marino | 2021/08/08 09:45 | Alexander Shevchenko v Matteo Donati | 6-3,3-6,7-5 |
| Challenger Iasi | 2021/07/14 11:05 | Felipe Meligeni Rodrigues Alves v Matteo Donati | 6-3,6-3 |
| Challenger Iasi | 2021/07/12 09:55 | Stefan Palosi v Matteo Donati | 4-6,4-6 |
| ITF M25 Wroclaw | 2021/06/27 14:00 | Matteo Donati v Dominik Kellovsky | 6-2,6-7,6-10 |
| ITF M15 Cairo | 2021/04/15 13:20 | Lukas Krainer v Matteo Donati | 6-2,4-6,6-4 |