| 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 Ungheria F3 | 2017/05/24 09:30 | Ken Onishi v Gabor Borsos | 1-6,1-6 |
| ITF Ungheria F2 | 2017/05/17 08:00 | Ken Onishi v Tomislav Jotovski | 6-4,2-6,4-6 |
| ITF Ungheria F2 | 2017/05/16 09:25 | Michal Schmid v Ken Onishi | 6-2,4-6,4-6 |
| ITF Ungheria F1 | 2017/05/11 11:40 | Attila Balazs v Ken Onishi | 6-2,6-2 |
| ITF Ungheria F1 | 2017/05/10 08:00 | Alexander Ovcharov v Ken Onishi | 1-6,3-6 |
| ITF Ungheria F1 | 2017/05/08 08:00 | Ken Onishi v Aljaz Radinski | 6-3,7-5 |
| Challenger Caltanissetta - Qual. | 2017/06/10 14:05 | Denys Molchanov v Adrian Ungur | 6-2,6-4 |
| Challenger Vicenza - Qual. | 2017/05/28 14:35 | Blaz Rola v Adrian Ungur | 6-3,6-1 |
| Challenger Vicenza - Qual. | 2017/05/27 13:40 | Romain Barbosa v Adrian Ungur | 2-6,4-6 |
| Challenger Mestre | 2017/05/23 12:45 | Adrian Ungur v Matteo Viola | 6-0,4-6,2-6 |
| Challenger Mestre - Qual. | 2017/05/22 10:00 | Mathias Bourgue v Adrian Ungur | 0-6,1-6 |
| Challenger Mestre - Qual. | 2017/05/21 12:15 | Ante Pavic v Adrian Ungur | 6-7,3-6 |
| Challenger Mestre - Qual. | 2017/05/20 17:35 | Julien Cagnina v Adrian Ungur | 5-7,1-6 |
| Challenger Francavilla - Qual. | 2017/04/24 09:00 | Filip Krajinovic v Adrian Ungur | 6-1,6-3 |