Round: 26 Ground: Clay
| ITF Germany F4 | 2017/06/20 09:00 | Fernando Yamacita v Boehler, Dominik | 6-3,2-6,3-6 |
| Challenger Heilbronn Qual | 2017/05/13 12:30 | Boehler, Dominik v Smith, John-Patrick | 5-7,5-7 |
| ITF France F10 | 2017/05/01 13:10 | Boehler, Dominik v Hamou, Maxime | 5-7,5-7 |
| ITF Greece F5 | 2017/04/04 10:00 | Boehler, Dominik v Caruana, Liam | 1-6,3-6 |
| Portugal F4, Singles Qualifying | 2017/03/29 17:15 | Bensoussan, Samuel v Boehler, Dominik | 6-3,3-6,6-3 |
| ITF Greece F2 Qual | 2017/03/14 07:30 | Boehler, Dominik v Gohlke, Delf | 6-2,7-5 |
| ITF Greece F1 | 2017/03/10 07:30 | Sebastian Ofner v Boehler, Dominik | 7-6,6-2 |
| ITF Greece F1 | 2017/03/08 15:15 | Boehler, Dominik v Hirschmueller, Christian | 6-3,6-4 |
| ITF Germany F4 | 2017/06/20 14:20 | Krohn, Linus v Onken, Julian | 5-7,6-7 |
| Turkey F15, Singles Qualifying | 2017/04/18 10:15 | Onken, Julian v Cem Ilkel | 2-6,3-6 |
| Turkey F14, Singles Qualifying | 2017/04/13 08:30 | Marsel Ilhan v Onken, Julian | 4-6,6-1,6-0 |
| Turkey F14, Singles Qualifying | 2017/04/11 07:30 | Navarro, Simon v Onken, Julian | 2-6,7-6,2-6 |
| ITF Croatia F4 | 2017/03/28 12:00 | Onken, Julian v Martin, Andrej | 4-6,7-6,1-6 |
| ITF Croatia F3 | 2017/03/21 09:00 | Jurij Rodionov v Onken, Julian | 2-6,7-6,6-1 |
| ITF Croatia F2 | 2017/03/16 12:05 | Riba, Pere v Onken, Julian | 6-1,6-2 |
| ITF Croatia F2 | 2017/03/15 09:00 | Onken, Julian v Mylokostov, Denys | 6-4,7-5 |