Stadium: Court 1 Round: 54 Ground: Clay
| ITF M25 Calabasas | 2024/03/19 17:00 | Hiroki Sakagawa v Lodewijk Weststrate | 6-2,6-3 |
| ITF M25 Calabasas | 2024/03/18 17:00 | Alex Kobelt v Lodewijk Weststrate | 2-6,2-6 |
| ITF M15 Eindhoven | 2023/07/30 12:00 | Jurriaan Bol v Lodewijk Weststrate | 6-4,3-6,10-7 |
| ITF M25 Esch/Alzette | 2023/07/19 10:50 | Lodewijk Weststrate v Mikalai Haliak | 6-7,6-4,3-6 |
| ITF M25 Esch/Alzette | 2023/07/17 13:20 | Lodewijk Weststrate v Felix Einig | 6-4,6-3 |
| ITF M25 Esch/Alzette | 2023/07/17 08:35 | Lodewijk Weststrate v Jim Hendrikx | 6-0,6-4 |
| ITF M25 The Hague | 2023/07/02 10:30 | Stijn Paardekooper v Lodewijk Weststrate | 6-2,6-4 |
| ITF M15 Alkmaar | 2023/06/28 16:20 | Lodewijk Weststrate v Mees Rottgering | 6-7,6-7 |
| 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 |
| ITF M15 San Diego | 2024/05/27 16:00 | Robin Catry v Stian Klaassen | 6-3,6-4 |
| 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 |