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 Amstelveen | 2024/06/30 09:00 | Fons Van Sambeek v Roland Stuurman | 6-3,6-4 |
| ITF M15 Alkmaar | 2024/06/26 09:00 | Fons Van Sambeek v Deney Wassermann | 6-7,6-3,5-7 |
| ITF M15 Saarlouis | 2024/06/19 08:30 | Bogdan Bobrov v Fons Van Sambeek | 6-1,7-6 |
| ITF M15 Saarlouis | 2024/06/17 10:00 | Fons Van Sambeek v Karlo Cubelic | 6-4,3-6,10-2 |
| ITF M15 Saarlouis | 2024/06/16 09:00 | Fons Van Sambeek v Henri Haupt | 6-1,6-3 |
| ITF M25 Deauville | 2024/05/22 11:00 | Paul Barbier Gazeu v Fons Van Sambeek | 7-5,6-2 |
| 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 Amstelveen | 2024/06/30 09:00 | Stephanos Schinas v Stian Klaassen | 1-6,3-6 |
| ITF M15 Alkmaar | 2024/06/26 12:00 | Stian Klaassen v Niels Visker | 2-6,3-6 |
| ITF M15 Alkmaar | 2024/06/24 08:00 | Lodewijk Weststrate v Stian Klaassen | 6-3,2-6,10-4 |
| ITF M15 San Diego | 2024/06/13 17:00 | Patrick Maloney v Stian Klaassen | 6-2,5-7,6-0 |
| ITF M15 San Diego | 2024/06/12 20:25 | Stian Klaassen v James Tracy | 6-2,1-6,6-4 |
| ITF M15 San Diego | 2024/06/11 17:00 | Joshua Charlton v Stian Klaassen | 3-6,3-6 |
| ITF M15 San Diego | 2024/06/04 16:00 | Stian Klaassen v Christopher Bulus | 4-6,2-6 |
| ITF M15 San Diego | 2024/06/03 16:00 | Benjamin Thomas George v Stian Klaassen | 0-6,0-6 |