| UTR Pro - Suita | 2024/04/26 00:30 | Shion Itsusaki v Shinnosuke Iwamoto | 2-6,4-6 |
| UTR Pro - Suita | 2024/04/25 02:44 | Shion Itsusaki v Kohtaro Kuriyama | 7-5,6-3 |
| UTR Pro - Suita | 2024/04/24 04:08 | Yuta Kikuchi v Shion Itsusaki | 6-0,6-2 |
| UTR Pro - Suita | 2024/04/23 06:08 | Natsuki Yamamoto v Shion Itsusaki | 7-6,4-6,6-4 |
| UTR Pro - Osaka | 2023/07/30 00:30 | Shion Itsusaki v Takeyasu Sekiguchi | 3-1 |
| UTR Pro - Osaka | 2023/07/28 05:43 | Hiroki Fujita v Shion Itsusaki | 1-6,2-3 |
| UTR Pro - Osaka | 2023/07/27 00:30 | Shin Inoue v Shion Itsusaki | 3-6,6-3,6-4 |
| UTR Pro - Osaka | 2023/07/26 08:28 | Christian Heaney-Secord v Shion Itsusaki | 3-6,5-7 |
| UTR Pro - Suita | 2024/04/27 00:30 | Wakamatsu Taichi v Seiya Nakanishi | 3-6,7-6,5-7 |
| UTR Pro - Suita | 2024/04/26 02:00 | Hiiro Sakamoto v Seiya Nakanishi | 3-6,6-2,2-6 |
| UTR Pro - Suita | 2024/04/25 04:13 | Yuto Okuchi v Seiya Nakanishi | 1-6,1-6 |
| UTR Pro - Suita | 2024/04/24 02:31 | Ryotaro Matsumura v Seiya Nakanishi | 6-4,6-0 |
| UTR Pro - Suita | 2024/04/22 04:59 | Taketo Takamisawa v Seiya Nakanishi | 6-4,4-6,7-5 |
| ITF - M15 Hinode | 2024/03/11 04:45 | Seiya Nakanishi v Shunsuke Nakagawa | 4-6,2-6 |
| ITF - M15 Hinode | 2024/03/11 01:00 | Jumpei Yamasaki v Seiya Nakanishi | 5-7,6-4,8-10 |
| ITF - M15 Yanagawa | 2023/12/25 00:30 | Kazuma Kawachi v Seiya Nakanishi | 6-3,6-0 |