Stadium: Court 2 Round: 54 Ground: Clay
| ITF M15 Eindhoven | 2023/08/01 14:40 | Stian Klaassen v Fons Van Sambeek | 7-6,6-3 |
| ITF M15 East Lansing | 2023/11/16 16:00 | Fons Van Sambeek v Perry Gregg | 4-6,3-6 |
| ITF M15 East Lansing | 2023/11/15 16:25 | Fons Van Sambeek v Nick Lagaev | 7-6,6-2 |
| ITF M15 Winston-Salem | 2023/11/08 19:00 | Fons Van Sambeek v Franco Capalbo | 3-6,3-6 |
| Challenger Charlottesville | 2023/10/29 20:25 | Sebastian Fanselow v Fons Van Sambeek | 6-0,6-1 |
| ITF M15 Norman | 2023/10/25 21:05 | Justin Schlageter v Fons Van Sambeek | 7-6,4-6,7-5 |
| ITF M15 Ithaca | 2023/10/06 15:00 | Alex Rybakov v Fons Van Sambeek | 6-4,6-3 |
| ITF M15 Ithaca | 2023/10/05 14:00 | Fons Van Sambeek v Danil Panarin | 7-6,1-6,6-3 |
| ITF M15 Ithaca | 2023/10/03 16:30 | Felipe Pinzon Moreno v Fons Van Sambeek | 0-6,4-6 |
| ITF M15 Eindhoven | 2023/08/02 11:00 | Elmer Moller v Stian Klaassen | 6-0,6-2 |
| ITF M15 Eindhoven | 2023/08/01 14:40 | Stian Klaassen v Fons Van Sambeek | 7-6,6-3 |
| ITF M15 Eindhoven | 2023/07/31 08:00 | Jack Loge v Stian Klaassen | 2-6,3-6 |
| ITF M15 Eindhoven | 2023/07/30 07:00 | Stian Klaassen v Twan Van Zijl | 6-3,6-1 |
| ITF M15 Metzingen | 2023/07/23 07:30 | Frederic Vogeli v Stian Klaassen | 6-2,6-7,10-5 |
| ITF M15 Alkmaar | 2023/06/26 10:30 | Max Van Nunen v Stian Klaassen | 5-7,1-6 |