Stadium: Court 6 Round: 27 Ground: Clay
| ITF M15 Xativa | 2023/08/03 16:30 | Ryan Nijboer v Alejandro T Alvarez | 6-1,6-3 |
| ITF M15 Xativa | 2023/08/01 15:30 | Ryan Nijboer v Toprak Avcibasi | 7-6,6-7,6-4 |
| ITF M25 Denia | 2023/07/26 16:25 | Sergi Perez Contri v Ryan Nijboer | 6-4,6-3 |
| Challenger Amersfoort | 2023/07/17 10:55 | Niels Visker v Ryan Nijboer | 7-6,3-6,7-5 |
| Challenger Amersfoort | 2023/07/16 14:55 | Ryan Nijboer v Yanaki Milev | 6-0,6-3 |
| ITF M25 Kassel | 2023/07/13 14:25 | Ryan Nijboer v Andrew Paulson | 6-7,4-6 |
| ITF M25 Kassel | 2023/07/11 14:45 | Ryan Nijboer v Viacheslav Bielinskyi | 6-2,6-2 |
| ITF M25 The Hague | 2023/07/07 16:30 | Guy Den Ouden v Ryan Nijboer | 6-1,6-2 |
| ITF M15 Xativa | 2023/08/03 15:00 | Fnu Nidunjianzan v Sergio Callejon Hernando | 3-6,3-6 |
| ITF M15 Xativa | 2023/08/02 20:25 | Sergio Callejon Hernando v Jorge Martinez Martinez | 6-3,6-1 |
| ITF M15 Xativa | 2023/08/01 08:45 | Javier Molino v Sergio Callejon Hernando | 7-6,5-7,2-10 |
| ITF M15 Xativa | 2023/07/31 15:00 | Pablo Alemany v Sergio Callejon Hernando | 4-6,2-6 |
| ITF M15 Xativa | 2023/07/30 15:00 | Felix Mischker v Sergio Callejon Hernando | 6-7,1-6 |
| ITF M25 Denia | 2023/07/24 09:00 | Sergio Callejon Hernando v Javier Molino | 5-7,7-6,7-10 |
| ITF M25 Denia | 2023/07/23 08:00 | Samuel Kyjaci v Sergio Callejon Hernando | 1-6,0-6 |
| ITF M25 Bakio | 2023/06/25 13:40 | Marc Saura Moragrega v Sergio Callejon Hernando | 6-4,6-4 |