Stadion: Court 4 Round: 26 Ground: Clay
| ITF - M15 - Duffel | 2023/06/16 11:00 | Ryan Nijboer v John Sperle | 6-4,4-6,6-3 |
| ITF - M25 - Sabadell | 2023/09/27 08:25 | Ryan Nijboer v Benjamin Winter Lopez | 7-6,6-1 |
| ITF - M15 - Madrid | 2023/09/10 09:00 | Ryan Nijboer v Pablo Masjuan Ginel | 6-4,6-3 |
| ITF - M15 - Madrid | 2023/09/08 09:25 | Mohamed Safwat v Ryan Nijboer | 5-7,3-6 |
| ITF - M15 - Madrid | 2023/09/07 08:00 | Gabriele Bosio v Ryan Nijboer | 1-6,5-7 |
| ITF - M15 - Madrid | 2023/09/06 13:35 | Jaime Caldes v Ryan Nijboer | 2-6,6-3,1-6 |
| ITF - M25 - Oviedo | 2023/09/02 10:00 | Carlos Lopez Montagud v Ryan Nijboer | 6-1,3-6,6-4 |
| ITF - M25 - Oviedo | 2023/09/01 08:00 | Gian Marco Moroni v Ryan Nijboer | 5-7,2-6 |
| ITF - M25 - Oviedo | 2023/08/31 08:00 | Ryan Nijboer v Dali Blanch | 6-3,6-1 |
| ITF - M25 - Sabadell | 2023/09/27 10:15 | John Sperle v Alejandro Juan Mano | 7-5,6-3 |
| ITF - M25 - Sabadell | 2023/09/26 07:55 | John Sperle v Arthur Bonnaud | 6-4,6-3 |
| ITF - M25 - Sabadell | 2023/09/25 07:30 | John Sperle v Jiri Cizek | 6-0,6-0 |
| ITF - M25 - Sabadell | 2023/09/24 07:30 | John Sperle v Carlos Giraldi | 6-0,6-3 |
| ITF - M15 - Buschhausen | 2023/09/12 10:00 | Justin Engel v John Sperle | 6-2,6-3 |
| ITF - M15 - Wien | 2023/09/01 11:25 | Gerald Melzer v John Sperle | 6-2,6-0 |
| ITF - M15 - Wien | 2023/08/31 08:00 | John Sperle v Buvaysar Gadamauri | 6-1,6-2 |
| ITF - M15 - Wien | 2023/08/30 09:50 | Paul Werren v John Sperle | 2-6,6-2,4-6 |