Stadium: Court 5 Round: 25 Ground: Carpet indoor
| German Championship | 2023/12/08 14:10 | Kai Lemstra v Max Hans Rehberg | 3-6,4-6 |
| German Championship | 2023/12/07 13:00 | Kai Lemstra v Edison Ambarzumjan | 6-3,6-1 |
| German Championship | 2023/12/06 12:20 | Kai Lemstra v Noel Larwig | 6-2,6-4 |
| ITF - M15 Heraklion | 2023/11/24 08:00 | Alastair Gray v Kai Lemstra | 6-3,7-5 |
| ITF - M15 Heraklion | 2023/11/22 12:25 | Alexandros Skorilas v Kai Lemstra | 6-7,1-6 |
| ITF - M15 Heraklion | 2023/11/16 08:00 | Kai Lemstra v Jakub Nicod | 6-7,6-1,3-6 |
| ITF - M15 Heraklion | 2023/11/14 08:30 | Kai Lemstra v Nikolay Nedelchev | 3-6,6-4,6-1 |
| ITF - M15 Selva Gardena | 2023/11/01 12:05 | Kai Lemstra v Hynek Barton | 4-6,4-6 |
| German Championship | 2023/12/08 16:20 | Vincent Marysko v Daniel Masur | 1-6,0-6 |
| German Championship | 2023/12/07 16:00 | Lewie Lane v Vincent Marysko | 3-6,6-4,6-7 |
| German Championship | 2023/12/06 10:00 | Vincent Marysko v Noah Thurner | 4-6,6-3,6-4 |
| ITF M15 Villers Les Nancy | 2023/10/16 07:00 | Mischa Lanz v Vincent Marysko | 6-3,7-5 |
| ITF M15 - Allershausen | 2023/08/30 12:40 | Tim Ruehl v Vincent Marysko | 6-4,6-0 |
| ITF M15 - Überlingen | 2023/08/15 08:00 | Milan Welte v Vincent Marysko | 6-4,6-1 |
| ITF M15 - Überlingen | 2023/08/14 08:00 | David Eichenseher v Vincent Marysko | 3-6,4-6 |
| ITF - M15 Frankfurt Am Main | 2023/08/08 10:45 | Niklas Schell v Vincent Marysko | 6-4,6-4 |