Stadium: Court 6 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Yanagawa | 2023/12/25 00:30 | Yuichiro Inui v Hiroki Sakagawa | 3-6,3-6 |
| ITF M15 Yanagawa | 2023/12/20 02:30 | Hiroki Sakagawa v Ryotaro Matsumura | 2-6,1-6 |
| ITF M15 Yanagawa | 2023/12/18 01:00 | Kenta Miyoshi v Hiroki Sakagawa | 4-6,6-2,9-11 |
| ITF M25 Sapporo | 2023/09/11 01:00 | Woobin Shin v Hiroki Sakagawa | 0-6,6-3,10-7 |
| ITF M25 Sapporo | 2023/09/10 01:00 | Hiroki Sakagawa v Hiroyasu Ehara | 6-7,6-1,10-6 |
| ITF M25 Sapporo | 2023/09/05 04:20 | Shuichi Sekiguchi v Hiroki Sakagawa | 6-3,6-2 |
| ITF M25 Sapporo | 2023/09/04 00:55 | Hiroki Sakagawa v Omar Fields | 5-7,6-3,13-11 |
| ITF M25 Sapporo | 2023/09/03 01:00 | Naoki Tajima v Hiroki Sakagawa | 2-6,3-6 |
| 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 |
| ITF M25 Takasaki | 2023/09/17 05:00 | Daiki Yoshimura v Shunsuke Nakagawa | 1-6,1-6 |
| ITF M25 Sapporo | 2023/09/11 00:50 | Ryotaro Taguchi v Shunsuke Nakagawa | 6-2,6-2 |
| ITF M25 Sapporo | 2023/09/10 01:00 | Kenta Nakamura v Shunsuke Nakagawa | 4-6,2-6 |
| ITF M15 Karuizawa | 2023/05/28 01:15 | Shunsuke Nakagawa v Shunrou Takeshima | 6-3,3-6,8-10 |