Stadium: Court 2 Round: 27 Ground: Hardcourt outdoor
| ITF M25 Takasaki | 2023/09/21 03:15 | Naoki Nakagawa v Daisuke Sumizawa | 7-5,6-4 |
| ITF M25 Takasaki | 2023/09/20 01:00 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/17 01:55 | Naoki Nakagawa v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/16 03:55 | Naoki Nakagawa v Hayato Matsuoka | 6-2,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/15 05:35 | Naoki Nakagawa v Koki Matsuda | 6-4,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/15 00:55 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/13 01:00 | Naoki Nakagawa v Yusuke Kusuhara | 6-2,7-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/09 02:00 | Naoki Nakagawa v Sekiguchi, Shuichi | 7-5,3-6,5-7 |
| ITF M25 Takasaki | 2023/09/21 03:30 | Hikaru Shiraishi v Taisei Ichikawa | 6-3,6-1 |
| ITF M25 Takasaki | 2023/09/20 06:45 | Kazuma Kawachi v Hikaru Shiraishi | 3-6,3-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/16 01:00 | Sekiguchi, Shuichi v Hikaru Shiraishi | 6-2,4-6,6-3 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/05 04:55 | Hikaru Shiraishi v Ryotaro Taguchi | 4-6,6-4,0-6 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/29 02:00 | Hikaru Shiraishi v Barki, Justin | 6-7,7-6,3-6 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/28 02:00 | Hikaru Shiraishi v Anthony Susanto | 6-2,6-4 |
| ITF - M15 Nakhon Si Thammarat | 2023/07/08 02:00 | Ryuki Matsuda v Hikaru Shiraishi | 6-2,3-6,6-4 |
| ITF - M15 Nakhon Si Thammarat | 2023/07/07 02:00 | Hikaru Shiraishi v Dzhavakian, Yurii | 6-2,7-5 |