Stadium: Court 3 Round: 26 Ground: Clay
| ITF M15 - Tanger | 2023/06/07 14:00 | Maik Steiner v Kai Lemstra | 1-6,5-7 |
| ITF - M15 Constanta | 2023/05/30 11:00 | Simon A Ivanov v Kai Lemstra | 6-2,6-2 |
| ITF M15 - Warmbad-Villach | 2023/05/23 07:30 | Kai Lemstra v Giovanni Oradini | 3-6,6-7 |
| ITF M15 - Warmbad-Villach | 2023/05/22 08:00 | Kai Lemstra v Igor Dudun | 6-1,6-2 |
| ITF M15 - Warmbad-Villach | 2023/05/21 10:00 | Kai Lemstra v Ivan Kremenchutskyi | 6-1,6-0 |
| ITF M15 - Telde | 2023/04/22 09:00 | Kai Lemstra v Marcel Zielinski | 2-6,4-6 |
| ITF M15 - Telde | 2023/04/21 09:00 | Kai Lemstra v Ignacio Buse | 6-4,6-2 |
| ITF M15 - Telde | 2023/04/20 10:30 | Alberto Barroso Campos v Kai Lemstra | 5-7,6-3,1-6 |
| ITF M15 - Tanger | 2023/06/07 09:00 | Stefano Reitano v Constantin Bittoun Kouzmine | 6-7,2-6 |
| Challenger - Troisdorf | 2023/05/30 11:20 | Hernan Casanova v Constantin Bittoun Kouzmine | 6-2,6-4 |
| Challenger - Troisdorf | 2023/05/29 08:30 | Oriol Roca Batalla v Constantin Bittoun Kouzmine | 7-5,6-3 |
| Challenger - Troisdorf | 2023/05/28 10:00 | Constantin Bittoun Kouzmine v Aldin Setkic | 6-7,6-4,6-4 |
| ITF M25 - Angers | 2023/04/20 12:05 | Constantin Bittoun Kouzmine v Lilian Marmousez | 6-3,1-6,4-6 |
| ITF M25 - Angers | 2023/04/19 11:50 | Constantin Bittoun Kouzmine v Loann Massard | 6-1,6-3 |
| ITF - M15 Monastir | 2023/04/06 08:30 | Daniil Ostapenkov v Constantin Bittoun Kouzmine | 7-6,4-6,6-3 |
| ITF - M15 Monastir | 2023/04/05 08:30 | Alexis Boureau v Constantin Bittoun Kouzmine | 2-6,2-6 |