Stadium: Court 14 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Sharm El Sheikh | 2023/02/08 08:00 | Guy Den Ouden v Matthew William Donald | 6-4,6-4 |
| Challenger Amersfoort | 2023/07/19 12:40 | Guy Den Ouden v Gauthier Onclin | 6-7,6-7 |
| Challenger Amersfoort | 2023/07/18 12:05 | Jesper De Jong v Guy Den Ouden | 4-6,6-3,3-6 |
| ITF M25 Esch/Alzette | 2023/07/12 08:00 | Brian Bozemoj v Guy Den Ouden | 6-4,6-3 |
| ITF M25 The Hague | 2023/07/09 08:50 | Guy Den Ouden v Max Houkes | 6-3,3-6,3-6 |
| ITF M25 The Hague | 2023/07/08 13:00 | Guy Den Ouden v Eric Vanshelboim | 1-6,6-0,6-2 |
| ITF M25 The Hague | 2023/07/07 16:30 | Guy Den Ouden v Ryan Nijboer | 6-1,6-2 |
| ITF M25 The Hague | 2023/07/06 16:45 | Collin Altamirano v Guy Den Ouden | 6-7,6-3,2-6 |
| ITF M25 The Hague | 2023/07/04 17:00 | Alec Deckers v Guy Den Ouden | 6-7,6-7 |
| 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 |