Round: 44 Ground: Carpet indoor
| ITF Germany F14 | 2017/10/08 11:30 | Johannes Haerteis v Jakob Cadonau | 6-1,6-2 |
| ITF France F19 | 2017/09/13 08:00 | Johannes Haerteis v Maxime Authom | 4-6,4-6 |
| ITF Germany F12 | 2017/08/23 09:30 | Peter Torebko v Johannes Haerteis | 7-6,6-3 |
| ITF Germany F10 | 2017/08/08 09:00 | Johannes Haerteis v Dominik Boehler | 6-4,4-6,2-6 |
| ITF Germany F9 | 2017/08/01 10:50 | Johannes Haerteis v Elmar Ejupovic | 6-7,3-6 |
| ITF Austria F3 | 2017/07/20 10:00 | Viktor Durasovic v Johannes Haerteis | 4-6,6-4,7-6 |
| ITF Austria F3 | 2017/07/19 08:00 | Christian Oliveira v Johannes Haerteis | 4-6,3-6 |
| ITF Austria F3 | 2017/07/18 08:00 | Johannes Haerteis v Matias Zukas | 6-1,2-6,6-1 |
| ITF Germany F14 | 2017/10/08 07:00 | Marcel Strickroth v Sven Lemstra | 6-0,1-6,3-6 |
| ITF Germany F14 | 2016/10/09 07:00 | Laurin Aerne v Sven Lemstra | 4-6,7-6,2-6 |
| ITF Germany F14 | 2016/10/09 07:00 | Sven Lemstra v Kai Lemstra | 1-6,2-6 |