Stadium: Court 8 Round: 27 Ground: Clay
| ITF M15 Alkmaar | 2023/06/29 18:40 | Karl Friberg v Twan Van Zijl | 6-3,6-0 |
| ITF M15 Alkmaar | 2023/06/28 13:05 | Karl Friberg v Roland Stuurman | 6-2,6-2 |
| ITF M25 Risskov/Aarhus | 2023/06/15 10:15 | Christian Sigsgaard v Karl Friberg | 6-3,6-0 |
| ITF M25 Risskov/Aarhus | 2023/06/13 08:30 | Gianluca Cadenasso v Karl Friberg | 3-6,1-6 |
| ITF M15 Vaasa | 2023/06/11 08:55 | Karl Friberg v Patrick Kaukovalta | 6-0,6-4 |
| ITF M15 Vaasa | 2023/06/10 08:00 | Karl Friberg v Tom Gentzsch | 6-1,6-1 |
| ITF M15 Vaasa | 2023/06/09 11:20 | Karl Friberg v Leonardo Rossi | 6-4,6-7,7-6 |
| ITF M15 Vaasa | 2023/06/08 09:15 | Karl Friberg v Nico Hornitschek | 6-3,6-3 |
| ITF M15 Alkmaar | 2023/06/29 12:05 | von Der Schulenburg, Jeffrey v Guy Den Ouden | 6-4,3-6,7-5 |
| 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 |