Stadium: Court 3 Round: 54 Ground: Hardcourt indoor
| Challenger Sopot | 2018/07/31 12:40 | Wojciech Marek v Daniel Gimeno-Traver | 5-7,4-6 |
| ITF Poland F3 | 2018/05/18 12:00 | Wojciech Marek v Pawel Juszczak | 6-7,1-6 |
| ITF Poland F3 | 2018/05/16 08:00 | Wojciech Marek v Piotr Matuszewski | 6-2,4-6,6-1 |
| ITF Poland F2 | 2018/05/08 10:00 | Marvin Netuschil v Wojciech Marek | 6-2,6-4 |
| ITF Poland F5 | 2017/07/10 11:35 | Daniel Michalski v Wojciech Marek | 6-1,7-6 |
| ITF Poland F3 | 2017/06/28 09:00 | Wojciech Marek v Jan Choinski | 2-6,2-6 |
| ITF Poland F3 | 2017/06/27 12:25 | Wojciech Marek v Oleg Prihodko | 6-3,6-2 |
| 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 |