Ground: Synthetic outdoor
| ITF Japan F7 | 2015/06/18 00:30 | Onozawa, Arata v Renta Tokuda | 6-4,6-2 |
| ITF Japan F7 | 2015/06/16 02:15 | Onozawa, Arata v Watanuki, Keisuke | 7-6,0-6,6-3 |
| ITF Japan F5 | 2015/06/02 01:00 | Makoto Ochi v Onozawa, Arata | 3-6,6-2,6-4 |
| ITF China F6 | 2015/05/26 07:20 | Onozawa, Arata v Gong, Peng-Xiang | 6-0,6-2 |
| ITF China F6 | 2015/05/20 02:00 | Onozawa, Arata v Qi, Xi | 4-6,1-6 |
| ITF Thailand F9 | 2015/05/06 03:00 | Onozawa, Arata v Burapharitta, Phassawit | 6-2,0-6,5-7 |
| ITF Thailand F9 | 2015/05/05 04:25 | Onozawa, Arata v Makoto Ochi | 6-3,6-3 |
| ITF Thailand F9 | 2015/04/29 04:55 | Sornbutnark, Warit v Onozawa, Arata | 6-3,6-2 |
| ITF Japan F7 | 2015/06/18 00:30 | Jumpei Yamasaki v Mclachlan, Ben | 6-4,6-4 |
| ITF Japan F7 Qual | 2015/06/14 00:00 | Jumpei Yamasaki v Yosuke Watanuki | 7-5,6-3 |
| ITF Japan F6 | 2015/06/11 01:00 | Kibi, Yuya v Jumpei Yamasaki | 7-6,6-2 |
| ITF Japan F6 | 2015/06/10 01:30 | Kang, Ku Keon v Jumpei Yamasaki | 4-6,6-7 |
| ITF Italy F30 | 2015/05/04 08:00 | Leonardi, Filippo v Jumpei Yamasaki | 7-5,3-6,6-3 |
| ITF Italy F7 | 2015/04/27 11:35 | Jumpei Yamasaki v Maccari, Federico | 4-6,5-7 |
| ITF Japan F4 | 2015/04/01 01:00 | Jumpei Yamasaki v Watanuki, Yusuke | 6-7,3-6 |
| ITF Japan F4 | 2015/03/30 05:00 | Naoki Nakagawa v Jumpei Yamasaki | 6-7,4-6 |