Stadium: Sub Court B Round: 54 Ground: Hardcourt outdoor
| ITF M15 Hinode | 2024/03/11 04:45 | Seiya Nakanishi v Shunsuke Nakagawa | 4-6,2-6 |
| ITF M25 Sapporo | 2024/09/08 01:00 | Shunsuke Nakagawa v Riku Takahata | 6-3,6-2 |
| ITF M15 Tokyo | 2024/07/02 03:10 | Taiyo Yamanaka v Shunsuke Nakagawa | 6-4,7-6 |
| ITF M15 Karuizawa | 2024/05/29 02:00 | Yusaku Sugaya v Shunsuke Nakagawa | 5-7,7-6,10-7 |
| ITF M15 Karuizawa | 2024/05/27 01:00 | Shunsuke Nakagawa v Toru Horie | 7-6,7-5 |
| ITF M15 Kashiwa | 2024/03/31 05:00 | Ray Ho v Shunsuke Nakagawa | 6-4,3-6,10-5 |
| ITF M15 Tsukuba | 2024/03/27 04:05 | Shunsuke Nakagawa v Kokoro Isomura | 3-6,6-4,0-6 |
| ITF M15 Tsukuba | 2024/03/25 06:00 | Shunsuke Nakagawa v Hayato Matsuoka | 6-3,3-6,4-10 |
| ITF M15 Nishi-Tokyo | 2024/03/21 03:10 | Jie Cui v Shunsuke Nakagawa | 6-0,6-4 |
| ITF M25 Sapporo | 2024/09/08 01:00 | Yusuke Yoshikawa v Seiya Nakanishi | 7-6,6-7,7-10 |
| ITF M25 Sapporo | 2024/09/02 02:35 | Brandon Perez v Seiya Nakanishi | 7-5,6-1 |
| UTR Pro Kawaguchi | 2024/08/18 00:00 | Seiya Nakanishi v Kazuki Sugimoto | 3-6,2-6 |
| UTR Pro Kawaguchi | 2024/08/17 00:00 | Sora Fukuda v Seiya Nakanishi | 3-6,0-6 |
| UTR Pro Kawaguchi | 2024/08/15 07:43 | Daisuke Sumizawa v Seiya Nakanishi | 6-2,6-3 |
| UTR Pro Kawaguchi | 2024/08/15 01:00 | Christopher Kosei Ono v Seiya Nakanishi | 6-7,5-7 |
| UTR Pro Kawaguchi | 2024/08/13 03:30 | Emon Van Loben Sels v Seiya Nakanishi | 6-3,6-1 |
| UTR Pro Kawaguchi | 2024/08/12 03:30 | Seiya Nakanishi v Mao Takada | 6-4,6-2 |