Round: 62 Ground: Clay
| ITF Germany F6 | 2017/07/02 08:00 | Tristan Meraut v Yohei Otsuka | 6-3,6-0 |
| ITF Germany F5 | 2017/06/26 08:00 | Yohei Otsuka v Michael Vrbensky | 2-6,2-6 |
| ITF Germany F5 | 2017/06/25 09:00 | Yohei Otsuka v Alexander Abou Boutros | 6-1,6-1 |
| ITF Germany F4 | 2017/06/17 14:00 | Yohei Otsuka v Leonard Von Hindte | 3-6,1-6 |
| ITF Turkey F18 | 2017/05/07 07:00 | Goran Markovic v Yohei Otsuka | 7-6,6-1 |
| ITF Turkey F18 | 2017/05/06 07:00 | Bekir Berk Sahin v Yohei Otsuka | 2-6,0-6 |
| ITF Turkey F17 | 2017/04/30 07:00 | Yohei Otsuka v Michiel de Krom | 2-6,2-6 |
| ITF Turkey F16 | 2017/04/22 06:00 | Yohei Otsuka v Daniel Mora | 0-6,1-6 |