Round: 44 Ground: Hardcourt outdoor
| ITF Japón F2 | 2018/03/11 00:30 | Issei Okamura v Yasunori Hashikawa | 6-2,6-1 |
| ITF Japón 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 China F2 | 2018/01/16 03:40 | Hu Liu v Issei Okamura | 7-5,4-6,2-6 |
| ITF China F1 - Masculino | 2018/01/11 02:30 | Ryota Tanuma v Issei Okamura | 6-1,6-2 |
| ITF Japón F1 | 2018/03/04 01:00 | Naoto Kai v Kaito Itsusaki | 6-7,6-2,6-3 |
| ITF Japón F1 | 2018/03/03 01:00 | Teppei Uesugi v Kaito Itsusaki | 7-6,0-6,2-6 |
| Challenger de Yokohama | 2018/02/27 01:00 | Go Soeda v Kaito Itsusaki | 6-0,6-2 |
| Challenger de Kioto - Clasificación | 2018/02/17 07:50 | Kaito Itsusaki v Takuto Niki | 4-6,0-6 |
| ITF Japón F7 | 2017/06/03 01:00 | Kaito Itsusaki v Teppei Uesugi | 6-7,6-1,3-6 |
| ITF Japón F6 | 2017/05/31 01:00 | Kaito Itsusaki v Shintaro Imai | 6-3,1-6,3-6 |
| ITF Japón F6 | 2017/05/29 04:00 | Yosuke Watanuki v Kaito Itsusaki | 1-6,7-6,1-6 |
| ITF Japón F5 | 2017/04/01 01:00 | Kaito Itsusaki v Masamichi Imamura | 3-6,4-6 |