Stadium: Court 1 Round: 28 Ground: Clay
| 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 Koszalin | 2023/09/06 15:00 | Marcel Zielinski v Bruno Kokot | 6-2,6-2 |
| ITF M15 Szczawno | 2023/08/31 14:35 | Patrick Zahraj v Marcel Zielinski | 6-3,6-3 |
| ITF M15 Szczawno | 2023/08/30 08:35 | Adam Majchrzak v Marcel Zielinski | 2-6,3-6 |
| ITF M15 Huy | 2023/08/25 08:00 | Marcel Zielinski v Felix Corwin | 6-1,1-6,3-6 |
| ITF M15 Huy | 2023/08/23 14:10 | Marcel Zielinski v Lautaro Agustin Falabella | 6-3,6-4 |
| ITF M15 Frankfurt Am Main | 2023/08/09 13:00 | Jakob Schnaitter v Marcel Zielinski | 6-7,6-2,6-2 |
| ITF M15 Koszalin | 2023/09/08 15:00 | Dominik Kellovsky v Tom Gentzsch | 6-2,5-7,6-4 |
| ITF M15 Koszalin | 2023/09/07 10:00 | Dominik Kellovsky v Tim Ruehl | 6-1,3-6,6-3 |
| ITF M15 Koszalin | 2023/09/06 14:15 | Dominik Kellovsky v Piotr Siekanowicz | 6-4,7-5 |
| ITF M15 Vienna | 2023/09/02 11:00 | Milos Karol v Dominik Kellovsky | 6-2,6-3 |
| ITF M15 Vienna | 2023/09/01 09:45 | Luka Mikrut v Dominik Kellovsky | 4-6,0-6 |
| ITF M15 Vienna | 2023/08/31 09:35 | Janos Fekete v Dominik Kellovsky | 5-7,6-1,3-6 |
| ITF M15 Vienna | 2023/08/30 11:20 | Yvo Panak v Dominik Kellovsky | 7-5,3-6,6-7 |
| ITF M25 Poznan | 2023/08/23 14:05 | Jeremy Jahn v Dominik Kellovsky | 7-5,6-4 |