| UTR Pro Suita | 2024/04/26 02:00 | Hiiro Sakamoto v Seiya Nakanishi | 3-6,6-2,2-6 |
| UTR Pro Suita | 2024/04/28 00:30 | Natsuki Yamamoto v Hiiro Sakamoto | 6-4,7-6 |
| UTR Pro Suita | 2024/04/27 07:18 | Nicholas Jovanovski v Hiiro Sakamoto | 4-6,2-3 |
| 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 05:10 | Hiiro Sakamoto v Taketo Takamisawa | 7-5,2-6,4-6 |
| UTR Pro Suita | 2024/04/24 04:10 | Jasper Lai v Hiiro Sakamoto | 0-6,0-0 |
| UTR Pro Suita | 2024/04/23 05:12 | Ryotaro Matsumura v Hiiro Sakamoto | 6-2,6-4 |
| UTR Pro Kawaguchi | 2024/03/10 01:30 | Kai Kawano v Hiiro Sakamoto | 4-6,3-6 |
| UTR Pro Kawaguchi | 2024/03/09 05:15 | Hiiro Sakamoto v Ryoto Tachi | 6-4,6-3 |
| UTR Pro Urayasu | 2024/05/06 02:15 | Toa Maeda v Seiya Nakanishi | 3-6,1-6 |
| UTR Pro Suita | 2024/04/28 02:00 | Shion Itsusaki v Seiya Nakanishi | 6-4,6-4 |
| 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 |