Stadium: Court 3 Round: 26 Ground: Hardcourt outdoor
| UTR Pro Tennis Series - Miki | 2022/12/11 00:30 | Kazuki Nishiwaki v Ryotaro Taguchi | 6-3,6-4 |
| ITF M15 - Kashiwa | 2024/04/02 02:10 | Toshihide Matsui v Kazuki Nishiwaki | 7-6,4-6,4-6 |
| ITF M15 - Tsukuba | 2024/03/27 00:50 | Yi Zhou v Kazuki Nishiwaki | 4-6,6-4,6-3 |
| ITF M15 - Nishi-Tokyo | 2024/03/20 06:30 | Leo Vithoontien v Kazuki Nishiwaki | 6-2,6-3 |
| ITF M15 - Torello | 2024/03/07 11:40 | Kazuki Nishiwaki v Ergi Kirkin | 1-6,1-6 |
| ITF M15 - Torello | 2024/03/06 12:40 | Kazuki Nishiwaki v Manel L Juncadella | 6-4,6-2 |
| ITF M15 - Villena | 2024/02/27 12:00 | Fausto Tabacco v Kazuki Nishiwaki | 6-3,6-1 |
| ITF M15 - Yanagawa | 2023/12/26 03:25 | Kazuki Nishiwaki v Jumpei Yamasaki | 3-6,3-6 |
| Challenger - Yokkaichi | 2023/11/26 04:20 | Calum Puttergill v Kazuki Nishiwaki | 7-5,6-2 |
| ITF M15 - Kashiwa | 2024/04/03 01:00 | Ryotaro Taguchi v Taiyo Yamanaka | 6-1,6-4 |
| ITF M15 - Kashiwa | 2024/04/01 04:40 | Ryotaro Taguchi v Kousuke Ogura | 6-1,6-2 |
| ITF M15 - Kashiwa | 2024/03/31 01:00 | Ryotaro Taguchi v Mattias Southcombe | 6-2,6-2 |
| ITF M15 - Tsukuba | 2024/03/28 03:20 | Ryotaro Taguchi v Sanhui Shin | 6-4,2-6,3-6 |
| ITF M15 - Tsukuba | 2024/03/27 06:35 | Jangjun Kim v Ryotaro Taguchi | 2-6,0-6 |
| ITF M15 - Tsukuba | 2024/03/25 06:00 | Ryotaro Taguchi v Koki Matsuda | 7-6,6-2 |
| ITF M15 - Nishi-Tokyo | 2024/03/23 01:40 | Ryotaro Taguchi v Hikaru Shiraishi | 2-6,6-4,4-6 |
| ITF M15 - Nishi-Tokyo | 2024/03/22 00:45 | Yan Bai v Ryotaro Taguchi | 3-6,5-7 |