Stadium: Court 12 Round: 25 Ground: Hardcourt outdoor
| UTR Pro Tennis Series Miki | 2022/07/10 00:30 | Kazuki Nishiwaki v Ryotaro Matsumura | 6-1,5-4 |
| ITF M15 Caloundra | 2023/07/25 04:05 | Daisuke Sumizawa v Kazuki Nishiwaki | 6-1,6-2 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/29 04:30 | S D Prajwal Dev v Kazuki Nishiwaki | 7-6,6-0 |
| Jakarta, Singles Main, M-ITF-INA-02A | 2023/06/28 05:30 | Kazuki Nishiwaki v Akay, Cihan | 6-4,6-3 |
| ITF M25 Jakarta | 2023/04/25 02:00 | Kazuki Nishiwaki v Tsung-Hao Huang | 3-6,5-7 |
| ITF M25 Jakarta | 2023/04/17 06:25 | Kazuki Nishiwaki v Kawahashi, Yuta | 4-6,4-6 |
| ITF M25 Jakarta | 2023/04/13 04:25 | Yuta Shimizu v Kazuki Nishiwaki | 6-2,6-4 |
| ITF M25 Jakarta | 2023/04/12 01:55 | Barki, Justin v Kazuki Nishiwaki | 6-7,2-6 |
| ITF M25 Jakarta | 2023/04/11 04:00 | Kazuki Nishiwaki v Yan Bai | 2-6,7-6,10-6 |
| ITF M15 Caloundra | 2023/07/25 04:15 | Ryotaro Matsumura v Thomas Braithwaite | 3-6,6-4,5-7 |
| Karuizawa, Singles M-ITF-JPN-07A | 2023/06/01 01:45 | Ryotaro Matsumura v Hikaru Shiraishi | 4-6,2-6 |
| Karuizawa, Singles M-ITF-JPN-07A | 2023/05/30 03:30 | Ryotaro Matsumura v Naoki Tajima | 3-6,6-1,6-4 |
| ITF - M15 Addis Ababa | 2023/05/23 12:00 | Nicolas Villalon v Ryotaro Matsumura | 6-4,6-2 |
| ITF - M15 Addis Ababa | 2023/05/18 09:10 | S D Prajwal Dev v Ryotaro Matsumura | 6-3,6-4 |
| ITF - M15 Addis Ababa | 2023/05/17 14:00 | Ryotaro Matsumura v Leonardo Catani | 6-4,6-4 |
| UTR Pro Miki | 2023/04/15 05:34 | Ryotaro Matsumura v Ryotaro Taguchi | 6-4,3-6,3-6 |
| UTR Pro Miki | 2023/04/14 02:00 | Ryotaro Matsumura v Tagashira, Kento | 6-1,6-3 |