Stadium: Court 3 Round: 54 Ground: Clay
| ITF M25 Kassel | 2023/07/10 08:00 | Vincent Marysko v Oskar Jansson | 4-6,6-4,10-8 |
| ITF M25 The Hague | 2023/07/05 17:10 | Collin Altamirano v Oskar Jansson | 6-2,6-4 |
| ITF M25 The Hague | 2023/07/03 13:55 | Oskar Jansson v David Quayle | 6-1,6-2 |
| ITF M25 The Hague | 2023/07/02 10:30 | Oskar Jansson v Miko Wassermann | 7-6,6-1 |
| ITF M15 Kalmar | 2023/05/19 10:25 | Oskar Jansson v Lucas Catarina | 6-7,6-7 |
| ITF M15 Kalmar | 2023/05/18 09:00 | Oskar Jansson v Erik Grevelius | 6-4,4-6,6-4 |
| ITF M15 Kalmar | 2023/05/17 12:30 | Lucas Renard v Oskar Jansson | 6-4,3-6,2-6 |
| ITF M15 Kalmar | 2023/05/16 10:10 | Mika Lipp v Oskar Jansson | 4-6,4-6 |
| ITF M25 Risskov/Aarhus | 2023/06/11 09:40 | Anders Grinderslev v Emil Chr E Mikkelsen | 6-1,6-0 |