Stadium: Court 4 Round: 26 Ground: Synthetic outdoor
| Yokohama, Japan, Qualifying | 2017/02/26 02:20 | Itsusaki, Kaito v Jumpei Yamasaki | 3-6,3-6 |
| ITF Japan F7 | 2018/06/04 03:10 | Itsusaki, Kaito v Taisei Miyamoto | 6-1,6-7,6-2 |
| ITF Japan F2 | 2018/03/12 00:30 | Issei Okamura v Itsusaki, Kaito | 6-4,6-1 |
| ITF Japan F1 | 2018/03/04 01:00 | Kai, Naoto v Itsusaki, Kaito | 6-7,6-2,6-3 |
| ITF Japan F1 | 2018/03/03 01:00 | Uesugi, Teppei v Itsusaki, Kaito | 7-6,0-6,2-6 |
| Challenger Yokohama | 2018/02/27 01:00 | Soeda, Go v Itsusaki, Kaito | 6-0,6-2 |
| Challenger Kyoto Qual | 2018/02/17 07:50 | Itsusaki, Kaito v Niki, Takuto | 4-6,0-6 |
| ITF Japan F7 | 2017/06/03 01:00 | Itsusaki, Kaito v Uesugi, Teppei | 6-7,6-1,3-6 |
| ITF Japan F6 | 2017/05/31 01:00 | Itsusaki, Kaito v Shintaro Imai | 6-3,1-6,3-6 |
| ITF Japan F7 | 2018/06/04 03:10 | Shimizu, Kazuki v Jumpei Yamasaki | 2-6,4-6 |
| ITF China F6 | 2018/05/16 02:00 | Jumpei Yamasaki v Takeuchi, Kento (1987) | 4-6,6-4,6-7 |
| ITF China F6 | 2018/05/14 05:45 | Wang, Huixin v Jumpei Yamasaki | 3-6,3-6 |
| ITF China F5 | 2018/05/12 03:00 | Jumpei Yamasaki v Rigele Te | 3-6,6-7 |
| ITF China F5 | 2018/05/11 06:05 | Jumpei Yamasaki v Kuan-Yi Lee | 6-4,6-4 |
| ITF China F5 | 2018/05/10 03:00 | Kim, Cheong-Eui v Jumpei Yamasaki | 2-6,5-7 |
| ITF China F5 | 2018/05/09 02:00 | Zou, Weibowen v Jumpei Yamasaki | 0-6,0-6 |
| ITF Vietnam F1 | 2018/05/03 03:00 | Chun Hsin Tseng v Jumpei Yamasaki | 6-2,6-3 |