Stadium: Center A Round: 27 Ground: Hardcourt outdoor
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/15 03:30 | Sekiguchi, Shuichi v Jumpei Yamasaki | 6-3,7-5 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/13 01:00 | Sekiguchi, Shuichi v Ryota Tanuma | 7-6,6-1 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/10 02:00 | Sekiguchi, Shuichi v Daisuke Sumizawa | 6-1,6-4 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/09 02:00 | Naoki Nakagawa v Sekiguchi, Shuichi | 7-5,3-6,5-7 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/08 02:30 | Sekiguchi, Shuichi v Jumpei Yamasaki | 6-4,6-3 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/07 01:00 | Sekiguchi, Shuichi v Chase Ferguson | 6-2,6-2 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/05 04:20 | Sekiguchi, Shuichi v Hiroki Sakagawa | 6-3,6-2 |
| Zhangjiagang, China | 2023/08/28 10:15 | Sekiguchi, Shuichi v Jie Cui | 1-6,2-6 |
| 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 |
| ITF - M15 Nakhon Si Thammarat | 2023/07/06 03:00 | Hikaru Shiraishi v Patrik Oplustil | 6-3,3-6,6-3 |
| ITF - M15 Karuizawa | 2023/06/03 03:30 | Kawahashi, Yuta v Hikaru Shiraishi | 7-5,1-6,10-7 |
| ITF - M15 Karuizawa | 2023/06/01 01:45 | Ryotaro Matsumura v Hikaru Shiraishi | 4-6,2-6 |