Stadium: Center Court Round: 45 Ground: Carpet indoor
| ITF Czech Republic F7 | 2018/10/23 11:10 | Kai Lemstra v Piotr Grynkowski | 4-6,6-1,4-6 |
| ITF Czech Republic F7 | 2018/10/22 14:00 | Kai Lemstra v Vitek Horak | 6-3,6-2 |
| 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 |
| Challenger Florence | 2018/09/29 09:40 | Jan Satral v Pawel Juszczak | 6-4,4-6,4-6 |
| Challenger Biella | 2018/09/18 12:00 | Jan Satral v Federico Delbonis | 6-3,3-6,1-6 |
| Challenger Biella | 2018/09/17 10:00 | Jan Satral v Oscar Jose Gutierrez | 6-2,6-2 |
| Challenger Biella | 2018/09/16 12:00 | Ivan Gakhov v Jan Satral | 7-6,4-6,1-6 |
| Challenger Biella | 2018/09/15 10:00 | Jan Satral v Julian Ocleppo | 6-2,7-5 |
| Challenger Szczecin | 2018/09/11 12:30 | Jan Satral v Guido Andreozzi | 4-6,2-6 |
| Challenger Szczecin | 2018/09/10 09:00 | Julian Lenz v Jan Satral | 2-6,3-6 |
| Challenger Szczecin | 2018/09/09 10:10 | Jan Satral v Andrea Pellegrino | 6-1,6-2 |