| ITF M15 Heraklion | 2022/11/08 07:30 | Daniel Siniakov v Marcel Zielinski | 6-1,6-2 |
| ITF M15 Heraklion | 2022/11/07 08:00 | Stefano D'Agostino v Marcel Zielinski | 3-6,6-3,4-10 |
| ITF M15 Heraklion | 2022/11/06 12:00 | Fabian Hansch Mauritzson v Marcel Zielinski | 1-6,0-6 |
| ITF M15 Heraklion | 2022/11/03 11:35 | Benjamin Pietri v Marcel Zielinski | 6-1,6-3 |
| ITF M15 Heraklion | 2022/11/02 11:50 | Marcel Zielinski v Szymon Kielan | 6-4,2-6,7-5 |
| ITF M15 Heraklion | 2022/11/01 07:30 | Marcel Zielinski v Benjamin Kreynes | 6-2,6-2 |
| ITF M15 Heraklion | 2022/10/30 07:00 | Marcel Zielinski v Damian Rodriguez | 6-2,6-7,10-7 |
| ITF M15 Lambermont | 2022/08/27 11:00 | Stijn Slump v Marcel Zielinski | 7-6,6-3 |
| German Championship | 2022/12/07 10:00 | Max Stenzer v Lasse Portner | 1-6,5-6 |
| German Championship | 2021/12/08 13:00 | Lasse Portner v Henri Squire | 2-6,2-6 |