Stadium: Court 1 Round: 26 Ground: Clay
| 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 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 M15 Koszalin | 2023/09/06 12:00 | Fryderyk Lechno-Wasiutynski v Henrik Bladelius | 6-3,6-3 |
| ITF M15 Szczawno | 2023/08/28 14:00 | Fryderyk Lechno-Wasiutynski v Karol Filar | 6-4,3-6,8-10 |
| ITF M15 Szczawno | 2023/08/28 08:30 | Philipp Pavlenko v Fryderyk Lechno-Wasiutynski | 4-6,1-6 |
| ITF M15 Szczawno | 2023/08/27 09:30 | Fryderyk Lechno-Wasiutynski v Andy Allen | 6-2,6-2 |
| ITF M25 Poznan | 2023/08/23 11:50 | Fryderyk Lechno-Wasiutynski v Tommaso Compagnucci | 3-6,2-6 |
| ITF M25 Bielsko Biala | 2023/08/16 10:40 | Fryderyk Lechno-Wasiutynski v Vladyslav Orlov | 6-7,2-6 |
| ITF M25 Lodz | 2023/08/09 15:50 | Jasza Szajrych v Fryderyk Lechno-Wasiutynski | 7-5,6-2 |
| ITF M15 Wroclaw | 2023/06/28 09:40 | Fryderyk Lechno-Wasiutynski v Matthew William Donald | 6-4,3-6,4-6 |