| UTR Pro Dubai | 2024/03/06 07:10 | Lazar Vojinovic v Koray Kirci | 3-6,1-6 |
| UTR Pro Dubai | 2024/03/05 09:00 | Mert Naci Turker v Koray Kirci | 7-5,6-1 |
| ITF M15 Antalya | 2024/02/28 12:10 | Dominik Kellovsky v Koray Kirci | 6-1,6-2 |
| ITF M25 Antalya | 2024/02/20 10:30 | Koray Kirci v Svyatoslav Gulin | 3-6,0-6 |
| UTR Pro Dubai | 2023/11/25 09:23 | Koray Kirci v Christos Keisidis | 6-4,3-6,1-5 |
| UTR Pro Dubai | 2023/11/24 08:00 | Delmas N'tcha v Koray Kirci | 6-1,4-6,7-5 |
| UTR Pro Dubai | 2023/11/23 10:06 | Giuseppe Tresca v Koray Kirci | 6-4,6-2 |
| UTR Pro Dubai | 2023/11/21 05:00 | Muhammad Shoaib v Koray Kirci | 4-6,6-0,4-6 |
| UTR Pro Dubai | 2024/03/05 05:00 | Lazar Vojinovic v Kai Lemstra | 4-6,7-5,6-7 |
| UTR Pro Dubai | 2024/03/04 06:30 | Kai Lemstra v Grigory Kuklin | 6-2,6-4 |
| ITF M25 Trento | 2024/02/20 10:30 | Andrea Guerrieri v Kai Lemstra | 6-1,7-5 |
| ITF M15 Oberhaching | 2024/02/13 10:00 | Tommaso Compagnucci v Kai Lemstra | 6-3,6-4 |
| ITF M25 Nussloch | 2024/01/24 15:15 | Kai Lemstra v Kirill Kivattsev | 1-6,6-7 |
| ITF M15 Cadolzburg | 2024/01/17 09:55 | Kai Lemstra v Vincent Marysko | 6-7,4-6 |
| German Championship | 2023/12/08 14:10 | Kai Lemstra v Max Hans Rehberg | 3-6,4-6 |
| German Championship | 2023/12/07 13:00 | Kai Lemstra v Edison Ambarzumjan | 6-3,6-1 |