Estádio: Court 5 Round: 25 Ground: Clay
| Challenger - Banja Luka | 2021/09/05 11:05 | Dragos Nicolae Madaras v Alexander Weis | 6-3,6-0 |
| ITF - M25 Sierre | 2021/09/01 11:35 | Yannik Steinegger v Alexander Weis | 6-7,7-6,6-3 |
| ITF - M25 Caslano | 2021/08/27 12:35 | Alexander Weis v Calvin Hemery | 2-6,4-6 |
| ITF - M25 Caslano | 2021/08/26 10:10 | Nicholas David Ionel v Alexander Weis | 3-6,3-6 |
| ITF - M25 Caslano | 2021/08/25 13:00 | Tristan Schoolkate v Alexander Weis | 4-6,3-6 |
| ITF - M15 Warmbad-Villach | 2021/08/22 09:00 | Peter Heller v Alexander Weis | 6-3,6-4 |
| 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 Pardubice | 2021/09/21 07:55 | Mikalai Haliak v Matyas Cerny | 6-3,6-1 |
| ITF - M25 Pardubice | 2021/09/20 09:00 | Mikalai Haliak v Sandro Szic | 7-6,6-4 |
| ITF - M15 Žilina | 2021/09/01 11:45 | Mikalai Haliak v Lukas Pokorny | 2-6,1-6 |
| ITF - M15 Bratislava | 2021/08/25 08:00 | Mikalai Haliak v Pavel Nejedly | 6-1,3-6,1-6 |
| ITF - M15 Bratislava | 2021/03/10 09:00 | Mikalai Haliak v Andrew Paulson | 6-7,1-6 |
| ITF - M15 Bratislava | 2021/03/09 09:00 | Mikalai Haliak v Kristof Minarik | 6-3,6-1 |
| ITF - M15 Bratislava | 2021/03/08 09:00 | Mikalai Haliak v Matej Galik | 7-5,6-4 |
| ITF - M15 Bratislava | 2021/03/04 13:30 | Kyrian Jacquet v Mikalai Haliak | 6-1,6-4 |