Stadium: Court 3 (CC) Round: 27 Ground: Clay
| ITF M15 Haren | 2023/09/07 09:00 | Svyatoslav Gulin v Kai Lemstra | 3-6,6-7 |
| ITF M15 Haren | 2023/09/06 11:30 | Kai Lemstra v Mika Lipp | 6-3,6-4 |
| ITF M15 Allershausen | 2023/09/02 12:00 | Adrian Oetzbach v Kai Lemstra | 6-4,6-3 |
| ITF M15 Allershausen | 2023/09/01 15:25 | Kai Lemstra v Daniel De Jonge | 7-5,6-1 |
| 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 Haren | 2023/09/07 13:25 | Thiemo De Bakker v Dax Donders | 7-6,6-2 |
| ITF M15 Haren | 2023/09/06 16:10 | Elgin Khoeblal v Thiemo De Bakker | 2-6,1-6 |
| ITF M15 Haren | 2023/09/05 08:00 | Thiemo De Bakker v Mats Bredschneijder | 6-2,6-0 |
| ITF M15 Haren | 2023/09/04 11:00 | Thiemo De Bakker v Louis Van Herck | 6-2,7-5 |
| ITF M25 Oldenzaal | 2023/08/30 17:35 | Oliver Crawford v Thiemo De Bakker | 3-6,6-1,6-3 |
| ITF M15 Huy | 2023/08/27 13:00 | Sidane Pontjodikromo v Thiemo De Bakker | 3-6,3-6 |
| ITF M15 Huy | 2023/08/26 11:00 | Felix Corwin v Thiemo De Bakker | 1-6,2-6 |
| ITF M15 Huy | 2023/08/25 15:00 | Jarno Jans v Thiemo De Bakker | 4-6,2-6 |