Stadium: Court 3 Round: 44 Ground: Hardcourt outdoor
| ITF Japan F2 | 2018/03/15 02:35 | Issei Okamura v Kaito Uesugi | 4-6,5-7 |
| ITF Japan F2 | 2018/03/13 00:30 | Issei Okamura v Rimpei Kawakami | 6-2,6-4 |
| ITF Japan F2 | 2018/03/12 00:30 | Issei Okamura v Kaito Itsusaki | 6-4,6-1 |
| ITF Japan F2 | 2018/03/11 00:30 | Issei Okamura v Yasunori Hashikawa | 6-2,6-1 |
| ITF Japan F1 | 2018/03/07 04:45 | Issei Okamura v Shinji Hazawa | 6-3,1-6,3-6 |
| ITF China F3 | 2018/01/25 05:15 | Issei Okamura v Tsung-Hua Yang | 3-6,1-6 |
| ITF China F3 | 2018/01/24 05:30 | Issei Okamura v Cing-Yang Meng | 7-6,6-2 |
| ITF China F3 | 2018/01/23 02:30 | Yan Bai v Issei Okamura | 1-6,0-6 |
| Challenger Kyoto Qual | 2018/02/17 06:55 | Cheong-Eui Kim v Arata Onozawa | 2-6,6-3,6-4 |
| ITF Vietnam F3 | 2017/11/23 03:00 | Arjun Kadhe v Arata Onozawa | 7-5,6-2 |
| ITF Vietnam F3 | 2017/11/21 03:00 | Arata Onozawa v Shunrou Takeshima | 6-0,6-3 |
| ITF Vietnam F3 | 2017/11/20 03:00 | Mislav Bosnjak v Arata Onozawa | 0-6,2-6 |
| ITF Vietnam F3 | 2017/11/19 07:00 | Huynh Thinh v Arata Onozawa | 2-6,0-6 |
| ITF Vietnam F1 | 2017/11/04 05:00 | Chanchai Sookton-Eng v Arata Onozawa | 5-7,3-6 |
| ITF Thailand F6 Qual | 2017/08/13 05:00 | Arata Onozawa v Chayanon Kaewsuto | 6-4,4-6,3-6 |
| ITF Thailand F5 | 2017/08/08 09:50 | Nam Hoang Ly v Arata Onozawa | 5-7,6-2,7-6 |