Stadium: Court 4 Round: 26 Ground: Clay
| ITF M15 Haren | 2023/09/05 17:30 | Guy Den Heijer v Kjell De Hek | 6-3,6-1 |
| ITF M25 Oldenzaal | 2023/08/30 18:10 | Aleksandr Braynin v Guy Den Heijer | 4-6,7-6,7-5 |
| ITF M25 Lesa | 2023/08/24 18:45 | Clement Tabur v Guy Den Heijer | 6-1,6-4 |
| ITF M25 Lesa | 2023/08/21 13:00 | Guy Den Heijer v Giuseppe La Vela | 4-6,2-6 |
| ITF M15 Eindhoven | 2023/07/31 08:00 | Guy Den Heijer v Daniel De Jonge | 6-7,7-5,11-13 |
| ITF M25 Esch/Alzette | 2023/07/20 09:30 | Guy Den Heijer v David Pichler | 7-5,3-6,5-7 |
| ITF M25 Esch/Alzette | 2023/07/19 12:05 | Guy Den Heijer v Jan Sebesta | 6-7,7-6,6-3 |
| ITF M25 Esch/Alzette | 2023/07/17 15:20 | Guy Den Heijer v William Jucha | 6-4,7-5 |
| ITF M15 Haren | 2023/09/06 08:45 | Thijmen Loof v Adrian Oetzbach | 6-4,5-7,4-6 |
| ITF M15 Allershausen | 2023/09/03 11:00 | Adrian Oetzbach v Nicola Kuhn | 6-4,5-7,1-6 |
| ITF M15 Allershausen | 2023/09/02 12:00 | Adrian Oetzbach v Kai Lemstra | 6-4,6-3 |
| ITF M15 Allershausen | 2023/09/01 10:00 | Jannik Maute v Adrian Oetzbach | 2-6,3-6 |
| ITF M15 Allershausen | 2023/08/31 09:55 | Justin Engel v Adrian Oetzbach | 7-6,4-6,4-6 |
| ITF M15 Allershausen | 2023/08/30 11:05 | Julian Peter v Adrian Oetzbach | 1-6,1-6 |
| ITF M15 Trier | 2023/08/22 11:00 | Kai Lemstra v Adrian Oetzbach | 7-6,6-3 |
| ITF M15 Uberlingen | 2023/08/18 11:30 | Arthur Nagel v Adrian Oetzbach | 6-1,6-4 |