Ground: Clay
| ITF M15 Valencia | 2025/02/12 15:17 | Max Alcala Gurri v Marcel Zielinski | 6-3,5-3 |
| ITF M15 Valencia | 2024/11/11 09:00 | Marcel Zielinski v Anas Mazdrashki | 2-6,5-7 |
| ITF M15 Valencia | 2024/11/10 13:00 | Marcel Zielinski v Pere Prat Turro | 7-6,6-3 |
| ITF M15 Melilla | 2024/09/20 07:30 | Benjamin Winter Lopez v Marcel Zielinski | 7-6,6-1 |
| ITF M15 Melilla | 2024/09/18 12:15 | Gabriel Elicha Navas v Marcel Zielinski | 2-6,3-6 |
| Challenger Dobrich | 2024/09/08 13:15 | Marcel Zielinski v Dominik Kellovsky | 3-6,1-6 |
| ITF M15 Constanta | 2024/09/05 07:00 | Matteo De Vincentis v Marcel Zielinski | 7-6,6-3 |
| ITF M15 Constanta | 2024/09/04 06:30 | Gabriel Ghetu v Marcel Zielinski | 3-6,2-6 |