Stadium: CEE Logistic Round: 27 Ground: Clay
| ITF M15 Allershausen | 2023/08/31 12:15 | Kai Lemstra v Taym Alazmeh | 6-2,6-2 |
| ITF M15 Allershausen | 2023/08/30 10:00 | Luca Wiedenmann v Kai Lemstra | 3-6,1-6 |
| ITF M15 Trier | 2023/08/24 10:30 | Max Wiskandt v Kai Lemstra | 6-4,6-4 |
| ITF M15 Trier | 2023/08/22 11:00 | Kai Lemstra v Adrian Oetzbach | 7-6,6-3 |
| ITF M15 Frankfurt Nad Mohanem | 2023/08/10 10:55 | Kai Lemstra v Johannes Haerteis | 7-5,4-6,2-6 |
| ITF M15 Frankfurt Nad Mohanem | 2023/08/08 09:00 | Kai Lemstra v Matthew William Donald | 6-3,6-1 |
| ITF M15 Metzingen | 2023/07/28 10:50 | Kai Lemstra v Sander Jong | 6-3,0-6,2-6 |
| ITF M15 Metzingen | 2023/07/27 15:00 | Kai Lemstra v Juan C P Angelo | 7-5,6-0 |
| ITF M15 Allershausen | 2023/08/31 10:00 | Mark Wallner v Daniel De Jonge | 5-7,2-6 |
| ITF M15 Allershausen | 2023/08/30 10:00 | Daniel De Jonge v Dominik Boehler | 6-4,7-6 |
| ITF M15 Huy | 2023/08/24 09:00 | Buvaysar Gadamauri v Daniel De Jonge | 6-4,6-3 |
| ITF M15 Huy | 2023/08/23 09:00 | Daniel De Jonge v Noah Merre | 1-6,6-2,6-0 |
| ITF M15 Huy | 2023/08/21 15:20 | Daniel De Jonge v Ruben Hartig | 6-3,5-7,5-10 |
| ITF M25 Koksijde | 2023/08/13 12:15 | Daniel De Jonge v Mats Bredschneijder | 4-6,6-1,5-10 |
| ITF M15 Eindhoven | 2023/08/01 11:35 | Daniel De Jonge v Maxime Mora | 6-1,5-7,1-6 |
| ITF M15 Eindhoven | 2023/07/31 08:00 | Guy Den Heijer v Daniel De Jonge | 6-7,7-5,11-13 |