Stadium: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Caloundra | 2023/08/01 03:40 | Kazuki Nishiwaki v Ryotaro Matsumura | 6-3,3-6,6-3 |
| UTR Pro Tennis Series - Miki | 2022/07/10 00:30 | Kazuki Nishiwaki v Ryotaro Matsumura | 6-1,5-4 |
| ITF - M25 Takasaki | 2023/09/22 01:00 | Kazuki Nishiwaki v Collin Altamirano | 3-6,1-6 |
| ITF - M25 Takasaki | 2023/09/21 01:50 | Kazuki Nishiwaki v Leo Vithoontien | 5-7,6-4,6-4 |
| ITF - M25 Takasaki | 2023/09/20 02:40 | Kazuki Nishiwaki v Taisei Miyamoto | 6-3,6-0 |
| ITF - M25 Sapporo | 2023/09/17 01:55 | Naoki Nakagawa v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| 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 - M15 Ahmedabad | 2023/10/10 03:30 | Digvijay Pratap Singh v Ryotaro Matsumura | 6-2,6-4 |
| ITF - M25 Takasaki | 2023/09/21 02:00 | Ryotaro Matsumura v Sora Fukuda | 1-6,1-6 |
| ITF - M25 Takasaki | 2023/09/20 01:00 | Ryotaro Matsumura v Toru Horie | 6-0,5-7,7-6 |
| ITF - M25 Takasaki | 2023/09/18 00:50 | Ryotaro Matsumura v Natsuki Yamamoto | 6-2,6-1 |
| ITF - M25 Takasaki | 2023/09/17 01:00 | Ryotaro Matsumura v Seiya Nakanishi | 6-2,6-4 |
| ITF - M25 Sapporo | 2023/09/10 03:00 | Ryotaro Matsumura v Yuta Tomida | 6-3,6-7,9-11 |
| ITF - M25 Sapporo | 2023/09/08 01:00 | Sora Fukuda v Ryotaro Matsumura | 4-6,6-3,6-4 |
| ITF - M25 Sapporo | 2023/09/07 03:00 | Ryotaro Matsumura v Tatsuma Ito | 7-6,6-4 |