| ITF Japan F6 Qual | 04/08 04:00 | 62 | Rio Noguchi v Kazuki Nishiwaki | 6-2,6-7,0-6 | |
| ITF Japan F6 Qual | 04/07 01:00 | 62 | Tamaki Yamao v Kazuki Nishiwaki | 6-4,3-6,3-6 | |
| ITF Egypt F10 | 03/21 10:00 | 25 | Kazuki Nishiwaki v Benjamin Lock | 6-7,4-6 | |
| ITF Egypt F10 | 03/19 08:00 | 62 | Michel Vernier v Kazuki Nishiwaki | 3-6,2-6 | |
| ITF Egypt F10 | 03/18 12:00 | 62 | Bruno Britez v Kazuki Nishiwaki | 6-7,2-6 | |
| ITF Egypt F10 | 03/17 14:30 | 62 | Kazuki Nishiwaki v Anton Chekhov | 6-2,6-2 | |
| ITF Egypt F9 | 03/15 10:30 | 26 | Benjamin Lock v Kazuki Nishiwaki | 6-2,6-3 | |
| ITF Egypt F9 | 03/14 10:25 | 25 | Kazuki Nishiwaki v Dejan Katic | 6-4,6-4 | |
| ITF Egypt F9 | 03/12 08:00 | 62 | Kazuki Nishiwaki v Anton Chekhov | 6-0,6-3 | |
| ITF Egypt F9 | 03/11 10:30 | 62 | Michel Vernier v Kazuki Nishiwaki | 6-4,3-6,2-6 | |
| ITF Egypt F8 | 03/07 08:00 | 25 | Kazuki Nishiwaki v Karim-Mohamed Maamoun | 6-7,1-6 | |
| ITF Egypt F8 | 03/05 08:00 | 62 | Oleksandr Bielinskyi v Kazuki Nishiwaki | 6-4,1-6,3-6 | |
| ITF Egypt F8 | 03/04 08:00 | 62 | Kazuki Nishiwaki v Dominic Weidinger | 6-2,6-3 | |
| ITF Egypt F8 | 03/03 10:30 | 62 | JiaJun He v Kazuki Nishiwaki | 0-6,2-6 | |
| ITF Egypt F7 | 02/25 08:00 | 62 | Oleksandr Bielinskyi v Kazuki Nishiwaki | 6-0,6-3 | |
| ITF Egypt F7 | 02/24 14:30 | 62 | Kazuki Nishiwaki v Fabian Gruber | 6-3,6-4 | |
| Challenger Toyota Qual | 11/11 04:10 | 45 | Kazuki Nishiwaki v Toshihide Matsui | 3-6,4-6 | |
| ITF Egypt F28 | 10/04 15:30 | 25 | Tomas Papik v Kazuki Nishiwaki | 6-1,5-7,6-4 | |
| ITF Egypt F28 | 10/02 14:00 | 62 | Kazuki Nishiwaki v Franco Feitt | 6-1,6-2 | |
| ITF Egypt F28 | 10/01 16:00 | 62 | Antonio Zucca v Kazuki Nishiwaki | 5-7,4-6 | |
| ITF Egypt F28 | 09/30 16:00 | 62 | Yuichiro Inui v Kazuki Nishiwaki | 3-6,2-6 | |
| ITF Egypt F27 Qual | 09/25 14:00 | 62 | Kacper Zuk v Kazuki Nishiwaki | 7-6,6-1 | |
| ITF Egypt F27 Qual | 09/24 13:30 | 62 | Kazuki Nishiwaki v Lance-Pierre Du Toit | 3-6,6-0,6-3 | |
| ITF Egypt F26 | 09/20 18:30 | 25 | David Perez Sanz v Kazuki Nishiwaki | 7-6,6-3 | |
| ITF China F12 | 07/11 04:25 | 25 | Di Wu v Kazuki Nishiwaki | 6-1,6-4 | |
| ITF China F12 Qual | 07/10 02:00 | 62 | Rhett Purcell v Kazuki Nishiwaki | 3-6,6-4,6-2 | |
| ITF China F12 Qual | 07/09 04:30 | 62 | Jianhui Li v Kazuki Nishiwaki | 3-6,0-6 | |
| ITF China F12 Qual | 07/08 01:30 | 62 | Kazuki Nishiwaki v Weiqiang Zheng | 3-6,6-3,7-6 | |
| ITF China F11 Qual | 07/03 04:00 | 62 | Shi Hong Zeng v Kazuki Nishiwaki | 6-2,6-1 | |
| ITF China F11 Qual | 07/02 07:50 | 62 | Zhe Zhou v Kazuki Nishiwaki | 0-6,2-6 |