| ITF Czech Republic F4 | 2017/07/05 10:30 | Jonathan Mridha v Ken Onishi | 6-2,6-1 |
| ITF Czech Republic F4 | 2017/07/04 09:35 | Ken Onishi v Michal Konecny | 3-6,6-4,7-5 |
| ITF Romania F4 | 2017/06/21 09:45 | Ken Onishi v Adrian Ungur | 2-6,0-6 |
| ITF Romania F3 | 2017/06/15 07:00 | Nicolae Frunza v Ken Onishi | 6-4,6-1 |
| ITF Romania F3 | 2017/06/14 07:00 | Riccardo Maiga v Ken Onishi | 7-6,1-6,2-6 |
| ITF Hungary F3 | 2017/05/24 09:30 | Ken Onishi v Gabor Borsos | 1-6,1-6 |
| ITF Hungary F2 | 2017/05/17 08:00 | Ken Onishi v Tomislav Jotovski | 6-4,2-6,4-6 |
| ITF Hungary F2 | 2017/05/16 09:25 | Michal Schmid v Ken Onishi | 6-2,4-6,4-6 |
| Wimbledon Qual | 2017/06/26 11:30 | Jeremy Jahn v Blake Mott | 4-6,4-6 |
| Challenger Todi | 2017/06/20 11:55 | Facundo Bagnis v Jeremy Jahn | 6-4,0-6,7-5 |
| Challenger Lyon | 2017/06/13 14:30 | Paul-Henri Mathieu v Jeremy Jahn | 6-3,6-1 |
| ITF Italy F15 | 2017/05/30 09:00 | Jeremy Jahn v Andrea Collarini | 1-6,5-7 |
| ITF Sweden F2 | 2017/05/17 08:15 | Jonathan Mridha v Jeremy Jahn | 1-6,7-6,7-6 |
| ITF Sweden F2 | 2017/05/16 09:35 | Karl Friberg v Jeremy Jahn | 5-7,2-6 |
| ATP Munich Qual | 2017/04/30 10:35 | Jeremy Jahn v Jozef Kovalik | 5-7,3-6 |
| Challenger Francavilla | 2017/04/24 13:55 | Jeremy Jahn v Alexander Bublik | 6-7,3-6 |