Stadium: LEXUS Court Round: 27 Ground: Clay
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/22 09:30 | Zielinski, Marcel v 헤겔, 팀 | 6-0,6-3 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/21 09:25 | Mika Brunold v Zielinski, Marcel | 3-6,1-6 |
| ITF M15 Meerbusch | 2023/04/27 08:55 | Zielinski, Marcel v Gavrielides, Liam | 6-7,1-6 |
| ITF M15 Meerbusch | 2023/04/26 09:00 | Zielinski, Marcel v 스펠레, 존 | 7-6,7-5 |
| Telde, Singles M-ITF-ESP-31A | 2023/04/23 09:00 | Zielinski, Marcel v Manzanera Pertusa, Alejandro | 4-6,6-7 |
| Telde, Singles M-ITF-ESP-31A | 2023/04/22 09:00 | 렘스트라, 카이 v Zielinski, Marcel | 2-6,4-6 |
| Telde, Singles M-ITF-ESP-31A | 2023/04/21 09:00 | Zielinski, Marcel v 쿠에바스, 마르틴 | 6-4,6-1 |
| Telde, Singles M-ITF-ESP-31A | 2023/04/20 12:30 | Martinez Martinez, Jorge v Zielinski, Marcel | 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 Kang, Kyle | 7-5,6-0 |
| ITF M15 Winston-Salem | 2022/11/08 17:30 | von Der Schulenburg, Jeffrey v 로센스, 마르틴스 | 6-4,6-4 |
| Challenger Charlottesville | 2022/10/30 18:05 | 스미스, 키간 v von Der Schulenburg, Jeffrey | 6-2,7-5 |
| ITF M25 Muttenz | 2022/08/18 07:00 | von Der Schulenburg, Jeffrey v 포니오, 기오바니 | 5-7,6-7 |