| 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 M15 Heraklion | 2023/11/22 12:25 | Alexandros Skorilas v Kai Lemstra | 6-7,1-6 |
| ITF M15 Heraklion | 2023/11/16 08:00 | Kai Lemstra v Jakub Nicod | 6-7,6-1,3-6 |
| ITF M15 Heraklion | 2023/11/14 08:30 | Kai Lemstra v Nikolay Nedelchev | 3-6,6-4,6-1 |
| ITF M25 Most | 2023/05/22 08:00 | Daniel Paty v Lukas Velik | 6-2,6-3 |
| ITF M25 Most | 2023/05/21 08:00 | Lukas Velik v Marcel Marlon Sudzum | 6-4,6-1 |
| ITF M25 Prague | 2023/05/16 08:00 | Mark Wallner v Lukas Velik | 6-2,6-3 |
| ITF M25 Prague | 2023/05/15 10:30 | Michal Krajci v Lukas Velik | 3-6,2-6 |
| ITF M25 Prague | 2023/05/14 10:00 | Lukas Velik v Timur Maulenov | 6-4,6-1 |
| ITF M15 Prostejov | 2022/09/25 10:30 | Lukas Velik v Daniel Orlita | 6-4,1-6,8-10 |
| ITF M25 Jablonec Nad Nisou | 2022/05/23 08:00 | Dominik Recek v Lukas Velik | 6-4,6-4 |
| ITF M25 Most | 2022/05/17 08:15 | Michel Hopp v Lukas Velik | 6-4,6-0 |