Stadium: Center A Round: 29 Ground: Hardcourt outdoor
| ITF M25 Sapporo | 2023/09/16 03:55 | Naoki Nakagawa v Hayato Matsuoka | 6-2,6-2 |
| ITF M25 Sapporo | 2023/09/15 05:35 | Naoki Nakagawa v Koki Matsuda | 6-4,6-2 |
| ITF M25 Sapporo | 2023/09/15 00:55 | Naoki Nakagawa v Seita Watanabe | 6-3,6-2 |
| ITF M25 Sapporo | 2023/09/13 01:00 | Naoki Nakagawa v Yusuke Kusuhara | 6-2,7-6 |
| ITF M25 Sapporo | 2023/09/09 02:00 | Naoki Nakagawa v Shuichi Sekiguchi | 7-5,3-6,5-7 |
| 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 Sapporo | 2023/09/16 05:30 | Shuichi Sekiguchi v Kazuki Nishiwaki | 6-0,5-7,4-6 |
| ITF M25 Sapporo | 2023/09/16 01:00 | Kazuki Nishiwaki v Yuki Mochizuki | 6-1,6-3 |
| ITF M25 Sapporo | 2023/09/15 03:20 | Kousuke Ogura v Kazuki Nishiwaki | 4-6,7-5,2-6 |
| ITF M25 Sapporo | 2023/09/13 04:00 | Kazuki Nishiwaki v Taki Adachi | 6-1,6-2 |
| ITF M25 Hong Kong | 2023/09/09 10:00 | Kazuki Nishiwaki v Coleman Wong | 2-6,7-5,8-10 |
| ITF M25 Hong Kong | 2023/09/07 07:00 | Jie Cui v Kazuki Nishiwaki | 5-7,4-6 |
| ITF M25 Hong Kong | 2023/09/06 02:00 | Collin Altamirano v Kazuki Nishiwaki | 3-6,5-7 |
| ITF M25 Tainan | 2023/08/26 02:00 | Kazuki Nishiwaki v Rishab Agarwal | 5-7,3-6 |