Stadium: Center Court A Round: 28 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/08 01:00 | Naoki Nakagawa v Kokoro Isomura | 6-2,6-0 |
| ITF M25 Sapporo | 2023/09/07 00:55 | Naoki Nakagawa v Shunsuke Wakita | 4-6,6-2,6-0 |
| ITF M25 Sapporo | 2023/09/06 01:00 | Naoki Nakagawa v Naoya Honda | 7-6,6-4 |
| ITF M25 Hong Kong | 2023/09/03 02:00 | Naoki Nakagawa v Adam Moundir | 2-6,6-4,6-10 |
| ITF M25 Hong Kong | 2023/08/31 02:00 | Naoki Nakagawa v Keisuke Saitoh | 6-4,6-7,6-1 |
| ITF M25 Hong Kong | 2023/08/30 03:50 | Naoki Nakagawa v Hong Kit Wong | 7-6,6-3 |
| ITF M25 Decatur | 2023/08/06 17:00 | Naoki Nakagawa v Cash Hanzlik | 6-4,1-6,4-6 |
| ITF M25 Decatur | 2023/08/05 15:25 | Naoki Nakagawa v Jonah Braswell | 6-2,4-6,6-1 |
| ITF M25 Sapporo | 2023/09/08 02:30 | Shuichi Sekiguchi v Jumpei Yamasaki | 6-4,6-3 |
| ITF M25 Sapporo | 2023/09/07 01:00 | Shuichi Sekiguchi v Chase Ferguson | 6-2,6-2 |
| ITF M25 Sapporo | 2023/09/05 04:20 | Shuichi Sekiguchi v Hiroki Sakagawa | 6-3,6-2 |
| Challenger Zhangjiagang | 2023/08/28 10:15 | Shuichi Sekiguchi v Jie Cui | 1-6,2-6 |
| Challenger Zhangjiagang | 2023/08/27 06:25 | Shuichi Sekiguchi v Francis Casey Alcantara | 7-5,6-3 |
| Challenger Zhuhai | 2023/08/22 07:00 | Dominik Palan v Shuichi Sekiguchi | 7-6,5-7,6-2 |
| Challenger Zhuhai | 2023/08/21 03:00 | Shuichi Sekiguchi v Markos Kalovelonis | 7-6,2-6,6-4 |
| ITF M25 Astana | 2023/08/05 07:45 | Yusuke Takahashi v Shuichi Sekiguchi | 6-4,6-4 |