Stadium: Südwestbank 1 Round: 25 Ground: Carpet indoor
| ITF Germany F1 | 2018/01/08 11:30 | Stefan Seifert v Robin Lang | 7-6,6-4 |
| ITF Germany F1 | 2018/01/07 15:00 | Antoine Walch v Stefan Seifert | 4-6,1-6 |
| ITF Germany F1 | 2018/01/07 08:00 | Albert Sprlak Puk v Stefan Seifert | 2-6,3-6 |
| ITF Germany F7 | 2014/07/10 09:30 | Alexey Vatutin v Stefan Seifert | 6-3,6-7,6-3 |
| ITF Germany F7 | 2014/07/08 09:30 | Stefan Seifert v Dimitar Kuzmanov | 7-6,4-6,6-3 |
| ITF Germany F1 | 2018/01/08 12:30 | Karlo Cubelic v Kai Lemstra | 6-4,2-6,4-6 |
| ITF Germany F1 | 2018/01/07 11:30 | Tim Heger v Kai Lemstra | 4-6,4-6 |
| Challenger Eckental Qual | 2017/10/28 13:30 | Benjamin Hassan v Kai Lemstra | 7-5,7-6 |
| ITF Germany F16 | 2017/10/22 08:00 | Kai Lemstra v Tim Seibert | 3-6,1-6 |
| Challenger Ismaning Qual | 2017/10/15 12:20 | Kai Lemstra v Farrukh Dustov | 3-6,6-3,3-6 |
| Challenger Ismaning Qual | 2017/10/14 15:05 | Sven Lemstra v Kai Lemstra | 2-6,0-6 |
| ITF Germany F14 | 2017/10/12 10:00 | Sami Reinwein v Kai Lemstra | 3-6,6-2,6-4 |
| ITF Germany F14 | 2017/10/11 10:00 | Kai Lemstra v Danylo Kalenichenko | 6-4,6-3 |