Stadium: Court 5 Round: 25 Ground: Clay
| Challenger Banja Luka | 2021/09/05 11:05 | Madaras, Dragos Nicolae 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 Aichhorn, Jakob | 6-1,0-6,6-2 |
| ITF M15 Warmbad-Villach | 2021/08/18 09:40 | Alexander Weis v Bachmaier, Philip | 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 Szic, Sandro | 7-6,6-4 |
| ITF M15 Zilina | 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 Nejedly, Pavel | 6-1,3-6,1-6 |
| ITF M15 Bratislava | 2021/03/10 09:00 | Mikalai Haliak v Paulson, Andrew | 6-7,1-6 |
| ITF M15 Bratislava | 2021/03/09 09:00 | Mikalai Haliak v Minarik, Kristof | 6-3,6-1 |
| ITF M15 Bratislava | 2021/03/08 09:00 | Mikalai Haliak v Galik, Matej | 7-5,6-4 |
| ITF M15 Bratislava | 2021/03/04 13:30 | Kyrian Jacquet v Mikalai Haliak | 6-1,6-4 |