Stadium: Court 4 Round: 26 Ground: Hardcourt outdoor
| ITF Japan F4 | 2017/03/28 03:00 | Kaito Uesugi v Issei Okamura | 6-3,6-3 |
| 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 |
| ITF China F2 | 2018/01/18 02:30 | Issei Okamura v Goran Markovic | 6-2,0-6,5-7 |
| ITF Japan F2 | 2018/03/13 02:00 | Kaito Uesugi v Takuto Niki | 6-0,6-3 |
| ITF Japan F1 | 2018/03/06 02:00 | Yuya Kibi v Kaito Uesugi | 7-6,4-6,6-3 |
| Challenger Yokohama | 2018/02/26 04:30 | Tatsuma Ito v Kaito Uesugi | 6-2,6-3 |
| Challenger Kyoto Qual | 2018/02/18 02:45 | Takanyi Garanganga v Kaito Uesugi | 4-6,6-3,6-4 |
| Challenger Kyoto Qual | 2018/02/17 04:20 | Kaito Uesugi v Mukund Sasikumar | 6-1,6-3 |
| Challenger Toyota | 2017/11/14 01:00 | Hubert Hurkacz v Kaito Uesugi | 6-3,6-0 |
| Challenger Toyota Qual | 2017/11/12 07:00 | Kaito Uesugi v Xin Gao | 7-5,6-4 |
| Challenger Toyota Qual | 2017/11/11 04:00 | Yan Bai v Kaito Uesugi | 5-7,6-7 |