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 Ehrat, Sandro | 1-6,4-6 |
| ITF Germany F14 | 2018/10/04 12:35 | Kai Lemstra v Cayre, Paul | 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 Walder, Jordi | 3-6,6-1,3-6 |
| ITF Germany F12 | 2018/08/15 15:00 | Dan Added v Kai Lemstra | 7-5,6-2 |
| Florence, Italy | 2018/09/29 09:40 | Satral, Jan v Pawel Juszczak | 6-4,4-6,4-6 |
| Challenger Biella | 2018/09/18 12:00 | Satral, Jan v Delbonis, Federico | 6-3,3-6,1-6 |
| Challenger Biella | 2018/09/17 10:00 | Satral, Jan v Oscar Jose Gutierrez | 6-2,6-2 |
| Challenger Biella | 2018/09/16 12:00 | Ivan Gakhov v Satral, Jan | 7-6,4-6,1-6 |
| Challenger Biella | 2018/09/15 10:00 | Satral, Jan v Ocleppo, Julian | 6-2,7-5 |
| Challenger Szczecin | 2018/09/11 12:30 | Satral, Jan v Guido Andreozzi | 4-6,2-6 |
| Challenger Szczecin | 2018/09/10 09:00 | Lenz, Julian v Satral, Jan | 2-6,3-6 |
| Challenger Szczecin | 2018/09/09 10:10 | Satral, Jan v Andrea Pellegrino | 6-1,6-2 |