Stadium: Court 1 Round: 25 Ground: Clay
| ITF M25 Cattolica | 2023/06/20 12:00 | Andrea Picchione v Jakob Schnaitter | 6-7,6-4,7-6 |
| ITF M15 Nyiregyhaza | 2023/06/09 12:00 | Dragos Nicolae Madaras v Jakob Schnaitter | 6-3,6-3 |
| ITF M15 Nyiregyhaza | 2023/06/08 08:00 | Martyn Pawelski v Jakob Schnaitter | 6-4,2-6,6-7 |
| ITF M15 Nyiregyhaza | 2023/06/07 08:00 | Jakob Schnaitter v Gergely Madarasz | 6-4,6-3 |
| ITF M15 Warmbad-Villach | 2023/05/24 07:25 | Bor Artnak v Jakob Schnaitter | 6-3,7-5 |
| ITF M15 Warmbad-Villach | 2023/05/22 08:00 | Jakob Schnaitter v Jimmy Yang | 6-1,6-7,10-7 |
| ITF M15 Warmbad-Villach | 2023/05/21 10:00 | Jakob Schnaitter v Mark Wallner | 6-3,6-0 |
| ITF M25 Prague | 2023/05/18 09:00 | Jakob Schnaitter v Lukas Neumayer | 6-7,3-6 |
| ITF M15 Eindhoven | 2023/08/03 11:20 | Elmer Moller v Marcel Zielinski | 6-3,6-1 |
| ITF M15 Eindhoven | 2023/08/01 15:20 | Alexis Boureau v Marcel Zielinski | 1-6,1-6 |
| ITF M25 Esch/Alzette | 2023/07/13 14:30 | Marcel Zielinski v Brian Bozemoj | 6-2,6-4 |
| ITF M25 Esch/Alzette | 2023/07/12 11:35 | Marcel Zielinski v Boris Fassbender | 6-3,6-1 |
| ITF M15 Sofia | 2023/07/06 08:10 | Matej Dodig v Marcel Zielinski | 6-4,6-2 |
| ITF M15 Sofia | 2023/07/05 09:45 | Alessandro Ingarao v Marcel Zielinski | 0-6,3-6 |
| ITF M15 Kamen | 2023/06/28 10:50 | Matyas Cerny v Marcel Zielinski | 6-4,6-4 |
| ITF M15 Saarlouis | 2023/06/23 16:30 | Marcel Zielinski v Jeffrey Von Der Schulenburg | 6-7,6-2,1-6 |