Stadium: Court 1 Round: 28 Ground: Clay
| ITF M15 Bad Waltersdorf | 2023/10/06 10:10 | Marcel Zielinski v David Pichler | 6-4,5-7,6-1 |
| ITF M15 Bad Waltersdorf | 2023/10/05 11:45 | Matthias Ujvary v Marcel Zielinski | 4-6,7-6,2-6 |
| ITF M15 Bad Waltersdorf | 2023/10/04 12:20 | Patrick Zahraj v Marcel Zielinski | 7-6,3-6,0-6 |
| ITF M15 Buschhausen | 2023/09/14 14:30 | Jonas Forejtek v Marcel Zielinski | 6-3,6-2 |
| ITF M15 Buschhausen | 2023/09/13 10:45 | Marcel Zielinski v Christian Hansen | 7-5,6-1 |
| ITF M15 Koszalin | 2023/09/09 11:00 | Marcel Zielinski v Dominik Kellovsky | 3-6,3-6 |
| ITF M15 Koszalin | 2023/09/08 10:00 | Marcel Zielinski v Patrick Zahraj | 6-3,7-5 |
| ITF M15 Koszalin | 2023/09/07 12:00 | Marcel Zielinski v Fryderyk Lechno-Wasiutynski | 6-7,7-5,6-4 |
| ITF M15 Bad Waltersdorf | 2023/10/06 13:20 | Sebastian Sorger v Matyas Fuele | 6-7,6-2,7-5 |
| ITF M15 Bad Waltersdorf | 2023/10/05 09:00 | Bor Artnak v Sebastian Sorger | 6-0,3-6,3-6 |
| ITF M15 Bad Waltersdorf | 2023/10/03 07:25 | Sebastian Sorger v Wenzel Graski | 6-0,6-3 |
| Challenger Bad Waltersdorf | 2023/09/19 08:00 | Sebastian Sorger v Zdenek Kolar | 1-6,5-7 |
| ITF M25 Maribor | 2023/09/06 07:30 | Toby Alex Kodat v Sebastian Sorger | 7-5,6-1 |
| ITF M15 Vienna | 2023/08/31 08:00 | Milos Karol v Sebastian Sorger | 6-4,6-3 |
| ITF M15 Vienna | 2023/08/30 10:05 | Lukas Rohseano v Sebastian Sorger | 1-6,1-6 |
| ITF M25 Osijek | 2023/08/11 12:45 | Sebastian Sorger v Valerio Aboian | 4-6,4-6 |