Round: 44 Ground: Carpet indoor
| 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 |
| ITF Germany F12 | 2017/08/22 08:00 | Kai Lemstra v Robin Lang | 4-6,6-0,1-6 |
| ITF Germany F12 | 2017/08/21 08:00 | Kai Lemstra v Robin Peham | 6-2,4-6,7-6 |
| ITF Germany F12 | 2017/08/20 08:00 | Kai Lemstra v Anton Chekhov | 6-2,2-6,6-1 |
| ITF Germany F11 | 2017/08/17 13:45 | Kai Lemstra v Daniel Kopeinigg | 6-7,2-6 |
| ITF Germany F15 | 2017/10/16 08:00 | Ryan Peniston v Tim Seibert | 6-1,6-4 |
| ITF Germany F11 | 2017/08/13 13:00 | Jakob Aichhorn v Tim Seibert | 6-4,6-7,6-1 |
| ITF Germany F11 | 2017/08/13 08:00 | Tim Seibert v Marek Flinner | 7-6,6-2 |
| ITF Germany F10 | 2017/08/06 11:00 | Eduardo Dischinger v Tim Seibert | 6-0,7-5 |
| ITF Germany F9 | 2017/07/31 15:00 | Tim Seibert v Matthew Dellavedova | 6-2,4-6,2-6 |
| ITF Germany F9 | 2017/07/31 09:00 | Tim Seibert v Hazem Naw | 7-6,0-6,6-2 |
| ITF Germany F9 | 2017/07/30 10:30 | Floris Van Den Brink v Tim Seibert | 2-6,4-6 |
| ITF Germany F2 Qual | 2017/01/16 14:00 | Tim Seibert v Vincent Jaensch-Mueller | 2-6,1-6 |