Stadium: Court 2 輪: 62 Ground: Hardcourt outdoor
| ITF M15日之出町 | 2024/03/11 01:00 | Jumpei Yamasaki v Seiya Nakanishi | 5-7,6-4,8-10 |
| ITF M15柳川 | 2023/12/25 00:30 | 河內一真 v Seiya Nakanishi | 6-3,6-0 |
| ITF M25高崎 | 2023/09/17 01:00 | 松村亮太朗 v Seiya Nakanishi | 6-2,6-4 |
| ITF M25札幌 | 2023/09/05 04:15 | 岡村一成 v Seiya Nakanishi | 6-1,6-1 |
| ITF M25札幌 | 2023/09/04 03:35 | Ryusuke Horiuchi v Seiya Nakanishi | 6-4,2-6,10-12 |
| ITF M15輕井澤 | 2023/05/28 01:15 | Seiya Nakanishi v Yua Taka | 4-6,2-6 |
| ITF M25柏市 | 2023/04/02 00:30 | 傑里米•金 v Seiya Nakanishi | 6-3,6-2 |
| ITF M25築波 | 2023/03/27 00:30 | Seiya Nakanishi v 岡村一成 | 2-6,4-6 |
| ITF M15日之出町 | 2024/03/11 01:00 | Sungbeen Sim v Shunsuke Nakagawa | 2-6,7-5,5-10 |
| ITF M15柳川 | 2023/12/28 00:55 | Shunsuke Nakagawa v Sanhui Shin | 1-6,6-3,1-6 |
| ITF M15柳川 | 2023/12/27 03:55 | Taiyo Yamanaka v Shunsuke Nakagawa | 6-4,4-6,5-7 |
| ITF M15柳川 | 2023/12/26 00:30 | 坂川裕樹 v Shunsuke Nakagawa | 5-7,4-6 |
| ITF M15柳川 | 2023/12/25 00:30 | Yusuke Kusuhara v Shunsuke Nakagawa | 4-6,2-6 |
| ITF M15柳川 | 2023/12/18 01:00 | Shunsuke Nakagawa v Hong-Lin Fu | 4-6,6-7 |
| 松山挑戰賽 | 2023/11/08 02:35 | 泰羅•丹尼爾 v Shunsuke Nakagawa | 6-1,6-2 |
| ITF M25高崎 | 2023/09/18 03:10 | 科林•阿尔塔米拉诺 v Shunsuke Nakagawa | 6-3,6-2 |