Stadium: Court 4 Round: 25 Ground: Clay
| ITF M15 Doboj | 2024/05/09 08:00 | Lilian Marmousez v Marcel Zielinski | 6-1,6-1 |
| ITF M15 Doboj | 2024/05/08 07:30 | Kai Lemstra v Marcel Zielinski | 2-6,4-6 |
| ITF M15 Antalya | 2024/04/24 06:55 | Marcel Zielinski v Stijn Slump | 1-6,0-6 |
| ITF M15 Telde | 2024/04/11 12:35 | Kane Bonsach Ganley v Marcel Zielinski | 7-6,7-6 |
| ITF M15 Telde | 2024/04/10 14:35 | Benjamin Pietri v Marcel Zielinski | 4-6,1-6 |
| ITF M15 Antalya | 2024/03/28 07:00 | Marcel Zielinski v Jiri Barnat | 2-6,0-6 |
| ITF M15 Antalya | 2024/03/27 08:50 | Marcel Zielinski v John Sperle | 7-5,6-4 |
| ITF M15 Antalya | 2024/03/21 07:00 | Marcel Zielinski v Ioan Alexandru Chirita | 6-7,1-6 |
| ITF M15 Sharm El Sheikh | 2024/03/17 11:30 | Xinyuan Xie v Liviu Popirlan | 7-6,6-0 |