| 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 |
| German Championship | 2023/12/06 12:20 | Kai Lemstra v Noel Larwig | 6-2,6-4 |
| ITF M15 Heraklion | 2023/11/24 08:00 | Alastair Gray v Kai Lemstra | 6-3,7-5 |
| ITF M25 Antalya | 2024/02/05 08:45 | Grigory Kuklin v Sasa Markovic | 0-6,4-6 |
| ITF M25 Antalya | 2024/02/04 07:00 | Grigory Kuklin v Ethan Terblanche | 6-0,6-2 |
| ITF M25 Madrid | 2023/12/03 14:00 | Michiel de Krom v Grigory Kuklin | 6-1,6-4 |
| ITF M25 Sabadell | 2023/09/24 07:30 | Ivan Zaytsev v Grigory Kuklin | 4-6,6-1,10-8 |
| UTR Pro Barcelona | 2023/08/13 09:26 | Marcos Giraldi Requena v Grigory Kuklin | 4-6,2-6 |
| UTR Pro Barcelona | 2023/08/12 14:00 | Grigory Kuklin v Marc Saura Moragrega | 6-4,3-1 |
| UTR Pro Barcelona | 2023/08/11 06:00 | Grigory Kuklin v Savriyan Danilov | 4-6,6-2,2-6 |
| UTR Pro Barcelona | 2023/08/09 06:00 | Grigory Kuklin v Nazim Makhlouf | 4-6,4-6 |