Stadium: Court 8 Round: 26 Ground: Clay
| ITF M15 Esch/Alzette | 2021/07/20 13:00 | von Der Schulenburg, Jeffrey v Guy Den Ouden | 6-4,3-6,7-5 |
| ITF - M15 Sharm El Sheikh | 2020/11/11 08:00 | Guy Den Ouden v von Der Schulenburg, Jeffrey | 2-6,5-7 |
| ITF M15 Alkmaar | 2023/06/28 14:20 | von Der Schulenburg, Jeffrey v Lalami Laaroussi, Younes | 7-5,7-5 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/25 12:00 | Sander Jong v von Der Schulenburg, Jeffrey | 6-1,6-0 |
| Saarlouis, Singles Qualifying M-ITF-GER-07A | 2023/06/23 16:30 | Marcel Zielinski v von Der Schulenburg, Jeffrey | 6-7,6-2,1-6 |
| 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 Alkmaar | 2023/06/28 11:30 | Deney Wassermann v Guy Den Ouden | 6-7,5-7 |
| ITF M25 Risskov/Aarhus | 2023/06/17 09:00 | Guy Den Ouden v Leo Borg | 6-3,4-6,1-6 |
| ITF M25 Risskov/Aarhus | 2023/06/16 09:55 | Max Houkes v Guy Den Ouden | 6-3,3-6,4-6 |
| ITF M25 Risskov/Aarhus | 2023/06/15 08:30 | Philipp Pavlenko v Guy Den Ouden | 2-6,1-6 |
| ITF M25 Risskov/Aarhus | 2023/06/14 08:25 | Overbeck, Carl Emil v Guy Den Ouden | 1-6,2-6 |
| ITF M25 Bodrum | 2023/05/25 07:00 | Valentin Vacherot v Guy Den Ouden | 6-3,6-3 |
| ITF M25 Bodrum | 2023/05/24 07:00 | Guy Den Ouden v Egor Agafonov | 6-1,7-6 |
| ITF M25 Bodrum | 2023/05/23 11:15 | Federico Campana v Guy Den Ouden | 3-6,3-6 |