Stadion: Court 4 Round: 25 Ground: Clay
| 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 |
| ITF - M15 - Tanger | 2023/06/07 14:00 | Maik Steiner v Kai Lemstra | 1-6,5-7 |
| ITF - M15 - Constanta | 2023/05/30 11:00 | Simon A Ivanov v Kai Lemstra | 6-2,6-2 |
| ITF - M15 - Warmbad-Villach | 2023/05/23 07:30 | Kai Lemstra v Giovanni Oradini | 3-6,6-7 |
| ITF - M15 - Warmbad-Villach | 2023/05/22 08:00 | Kai Lemstra v Igor Dudun | 6-1,6-2 |
| ITF - M15 - Monastir | 2023/07/28 08:30 | Kris Van Wyk v Matthew William Donald | 6-1,6-4 |
| ITF - M15 - Monastir | 2023/07/27 10:25 | Matthew William Donald v Dylan Salton | 6-1,6-1 |
| ITF - M15 - Monastir | 2023/07/26 10:00 | Matthew William Donald v Gabriele Bosio | 4-6,6-2,6-3 |
| ITF - M15 - Monastir | 2023/07/18 10:20 | Kody Pearson v Matthew William Donald | 6-1,6-2 |
| ITF - M15 - Wroclaw | 2023/06/29 08:00 | Matthew William Donald v Sergey Fomin | 2-6,6-4,2-6 |
| ITF - M15 - Wroclaw | 2023/06/28 09:40 | Fryderyk Lechno-Wasiutynski v Matthew William Donald | 6-4,3-6,4-6 |
| ITF - M15 - Store | 2023/06/21 11:00 | Lorenzo Bocchi v Matthew William Donald | 6-4,6-4 |
| ITF - M25 - Jablonec Nad Nisou | 2023/05/31 09:30 | Matthew William Donald v Michael Vrbensky | 6-7,1-6 |