Stadium: LEXUS Court Round: 27 Ground: Clay
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/22 09:30 | Marcel Zielinski v Heger, Tim | 6-0,6-3 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/21 09:25 | Mika Brunold v Marcel Zielinski | 3-6,1-6 |
| ITF - M15 Meerbusch | 2023/04/27 08:55 | Marcel Zielinski v Liam Gavrielides | 6-7,1-6 |
| ITF - M15 Meerbusch | 2023/04/26 09:00 | Marcel Zielinski v John Sperle | 7-6,7-5 |
| ITF - M15 Telde | 2023/04/23 09:00 | Marcel Zielinski v Alejandro Manzanera Pertusa | 4-6,6-7 |
| ITF - M15 Telde | 2023/04/22 09:00 | Kai Lemstra v Marcel Zielinski | 2-6,4-6 |
| ITF - M15 Telde | 2023/04/21 09:00 | Marcel Zielinski v Cuevas, Martin | 6-4,6-1 |
| ITF - M15 Telde | 2023/04/20 12:30 | Jorge Martinez Martinez v Marcel Zielinski | 3-6,2-6 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/22 11:10 | Tom Gentzsch v von Der Schulenburg, Jeffrey | 4-6,3-6 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/19 09:30 | von Der Schulenburg, Jeffrey v Jim Hendrikx | 6-1,6-4 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/18 12:00 | von Der Schulenburg, Jeffrey v Ruben Hartig | 6-1,6-0 |
| ITF M15 Winston-Salem | 2022/11/10 16:50 | von Der Schulenburg, Jeffrey v Samuel, Toby | 1-6,1-6 |
| ITF M15 Winston-Salem | 2022/11/09 18:40 | von Der Schulenburg, Jeffrey v Kyle Kang | 7-5,6-0 |
| ITF M15 Winston-Salem | 2022/11/08 17:30 | von Der Schulenburg, Jeffrey v Martins Rocens | 6-4,6-4 |
| Challenger Charlottesville | 2022/10/30 18:05 | Keegan Smith v von Der Schulenburg, Jeffrey | 6-2,7-5 |
| ITF M25 Muttenz | 2022/08/18 07:00 | von Der Schulenburg, Jeffrey v Giovanni Fonio | 5-7,6-7 |