Stadium: Court 1 Round: 54 Ground: Carpet indoor
| Challenger Ismaning | 2018/10/16 15:25 | Gregoire Barrere v Kai Lemstra | 7-6,6-3 |
| ITF Germany F15 | 2018/10/09 12:00 | Kai Lemstra v Sandro Ehrat | 1-6,4-6 |
| ITF Germany F14 | 2018/10/04 12:35 | Kai Lemstra v Paul Cayre | 6-4,3-6,4-6 |
| ITF Germany F14 | 2018/10/03 15:50 | Louis Wessels v Kai Lemstra | 6-7,6-1,4-6 |
| ITF Germany F13 | 2018/08/20 09:00 | Kai Lemstra v Jordi Walder | 3-6,6-1,3-6 |
| ITF Germany F12 | 2018/08/15 15:00 | Dan Added v Kai Lemstra | 7-5,6-2 |
| ITF Slovakia F2 | 2018/07/31 07:00 | Kai Lemstra v Samuel Hodor | 4-6,2-6 |
| ITF Slovakia F2 | 2018/07/30 07:00 | Kai Lemstra v Daniel Rabas | 6-1,6-1 |
| Challenger Prague | 2018/07/21 12:40 | Pawel Juszczak v Vitek Horak | 6-1,6-3 |
| ITF Czech Republic F3 Qual | 2018/05/27 08:00 | Kenneth Raisma v Vitek Horak | 6-4,6-3 |
| ITF Czech Republic F3 Qual | 2018/05/26 08:00 | Vitek Horak v Nikolas Lahky | 6-1,6-2 |