Results
| ITF M15 Osaka | 04/23 06:18 | - | Leo Vithoontien v Kazuki Nishiwaki | 6-3,2-6,6-4 | |
| ITF M15 Osaka | 04/21 01:00 | - | Kazuki Nishiwaki v Yamato Yukawa | 7-6,3-6,0-1 | |
| ITF M15 Osaka | 04/15 01:00 | - | Kazuki Nishiwaki v Benjamin O'Connell | 6-3,2-6,0-1 | |
| UTR Pro Yokohama | 02/01 01:10 | 28 | Kazuki Nishiwaki v Koki Matsuda | 2-6,0-6 | |
| UTR Pro Yokohama | 01/31 04:40 | - | Kazuki Nishiwaki v Toshiki Karigyo | 6-3,7-5 | |
| UTR Pro Yokohama | 01/30 04:45 | - | Kazuki Nishiwaki v Christopher Kosei Ono | 0-6,7-5,7-5 | |
| UTR Pro Yokohama | 01/28 05:10 | - | Mst Rehana Parvin v Kazuki Nishiwaki | 3-6,6-1,2-6 | |
| ITF M25 Chennai | 01/13 03:30 | - | Abhinav Sanjeev Shanmugam v Kazuki Nishiwaki | 0-0 | |
| ITF M25 Bhopal | 01/06 05:00 | - | Yuvan Nandal v Kazuki Nishiwaki | 1-6,6-3,1-0 | |
| UTR Pro Yokohama | 12/01 03:10 | - | Kazuki Nishiwaki v Hakuto Imanishi | 6-0,7-6 | |
| UTR Pro Yokohama | 11/30 05:00 | - |
Kazuki Nishiwaki v
Yuzuki Shinde
|
6-3,6-1 | |
| UTR Pro Yokohama | 11/29 01:00 | - | Haruki Katsushima v Kazuki Nishiwaki | 3-6,7-6,4-6 |
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