Stadium: CEE Logistic Round: 25 Ground: Clay
| Challenger Augsburg | 2023/08/20 11:30 | Hady Habib v Luca Wiedenmann | 6-3,6-7,6-2 |
| ITF M15 Ueberlingen | 2023/08/17 13:40 | Adrian Oetzbach v Luca Wiedenmann | 6-2,7-5 |
| ITF M15 Ueberlingen | 2023/08/16 13:50 | Milan Welte v Luca Wiedenmann | 7-5,3-6,4-6 |
| ITF M15 Eupen | 2023/08/11 16:30 | Luca Wiedenmann v Marc Majdandzic | 4-6,7-5,3-6 |
| ITF M15 Eupen | 2023/08/10 09:00 | Luca Wiedenmann v Maik Steiner | 3-6,6-3,6-1 |
| ITF M15 Eupen | 2023/08/09 10:00 | Luca Wiedenmann v Pietro Marino | 6-2,7-5 |
| ITF M25 Wetzlar | 2023/08/04 08:00 | Luca Wiedenmann v Nicola Kuhn | 4-6,4-6 |
| ITF M25 Wetzlar | 2023/08/03 09:15 | Luca Wiedenmann v Max Schoenhaus | 7-5,6-1 |
| 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 Am Main | 2023/08/10 10:55 | Kai Lemstra v Johannes Haerteis | 7-5,4-6,2-6 |
| ITF M15 Frankfurt Am Main | 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 Metzingen | 2023/07/26 12:30 | Stefanos Sakellaridis v Kai Lemstra | 3-6,3-6 |
| ITF M15 Tanger | 2023/06/08 11:00 | Kai Lemstra v Constantin Bittoun Kouzmine | 3-6,3-6 |