Stadium: Court 2 Round: 62 Ground: Hardcourt outdoor
| 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 |
| ITF - M25 Takasaki | 2023/09/17 01:00 | Ryotaro Matsumura v Seiya Nakanishi | 6-2,6-4 |
| ITF - M25 Sapporo | 2023/09/05 04:15 | Issei Okamura v Seiya Nakanishi | 6-1,6-1 |
| ITF - M25 Sapporo | 2023/09/04 03:35 | Ryusuke Horiuchi v Seiya Nakanishi | 6-4,2-6,10-12 |
| ITF - M15 Karuizawa | 2023/05/28 01:15 | Seiya Nakanishi v Yua Taka | 4-6,2-6 |
| ITF - M25 Kashiwa | 2023/04/02 00:30 | Jeremy Jin v Seiya Nakanishi | 6-3,6-2 |
| ITF - M25 Tsukuba | 2023/03/27 00:30 | Seiya Nakanishi v Issei Okamura | 2-6,4-6 |
| ITF M15 - Hinode | 2024/03/11 01:00 | Sungbeen Sim v Shunsuke Nakagawa | 2-6,7-5,5-10 |
| ITF - M15 Yanagawa | 2023/12/28 00:55 | Shunsuke Nakagawa v Sanhui Shin | 1-6,6-3,1-6 |
| ITF - M15 Yanagawa | 2023/12/27 03:55 | Taiyo Yamanaka v Shunsuke Nakagawa | 6-4,4-6,5-7 |
| ITF - M15 Yanagawa | 2023/12/26 00:30 | Hiroki Sakagawa v Shunsuke Nakagawa | 5-7,4-6 |
| ITF - M15 Yanagawa | 2023/12/25 00:30 | Yusuke Kusuhara v Shunsuke Nakagawa | 4-6,2-6 |
| ITF - M15 Yanagawa | 2023/12/18 01:00 | Shunsuke Nakagawa v Hong-Lin Fu | 4-6,6-7 |
| Challenger - Matsuyama | 2023/11/08 02:35 | Taro Daniel v Shunsuke Nakagawa | 6-1,6-2 |
| ITF - M25 Takasaki | 2023/09/18 03:10 | Collin Altamirano v Shunsuke Nakagawa | 6-3,6-2 |