Stadium: Court 4 Round: 62 Ground: Clay
| ITF M25 Koksijde | 2023/08/15 12:35 | de Bakker, Thiemo v Mariano Kestelboim | 3-6,3-6 |
| ITF M25 Koksijde | 2023/08/14 09:50 | de Bakker, Thiemo v Giacomo Crisostomo | 6-1,6-2 |
| ITF M25 Koksijde | 2023/08/13 08:00 | de Bakker, Thiemo v Ilian Borlee | 6-3,6-0 |
| ITF M25 The Hague | 2023/07/06 17:00 | de Bakker, Thiemo v Deney Wassermann | 6-7,6-1,4-6 |
| ITF M25 The Hague | 2023/07/05 16:55 | Kyvan Rietkerk v de Bakker, Thiemo | 2-6,2-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/29 03:25 | Karan Singh v de Bakker, Thiemo | 5-7,6-7 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/28 02:00 | Susanto, David Agung v de Bakker, Thiemo | 5-7,4-6 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/21 02:00 | Anthony Susanto v de Bakker, Thiemo | 4-6,3-6 |
| ITF M15 Huy | 2023/08/20 08:00 | Leon Formella v Johnson, Austin | 7-5,6-4 |
| ITF M25 Muttenz | 2023/08/14 10:10 | Leon Formella v Giuseppe La Vela | 4-6,3-6 |
| ITF M15 Eupen | 2023/08/08 08:00 | Stijn Slump v Leon Formella | 6-4,6-2 |
| ITF M15 Eupen | 2023/08/07 07:00 | Julian Peter v Leon Formella | 4-6,2-6 |
| ITF M15 Novi Sad | 2023/07/31 07:00 | Daniil Ostapenkov v Leon Formella | 6-1,6-2 |
| ITF M25 Bacau | 2023/07/23 08:30 | Leon Formella v Louis Allen | 2-6,4-6 |
| ITF M15 Uslar | 2023/07/17 09:00 | Leon Formella v Jeremy Schifris | 1-6,1-6 |
| ITF - M25 Grasse | 2023/06/12 07:30 | Pablo Trochu v Leon Formella | 6-1,6-0 |