Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Changwon | 2022/08/25 03:00 | Ku Keon Kang v Kazuki Nishiwaki | 3-6,1-6 |
| ITF M15 Antalya | 2023/12/05 09:00 | Louroi Martinez v Ku Keon Kang | 1-6,6-2,10-6 |
| ITF M15 Antalya | 2023/12/04 07:00 | Ku Keon Kang v Ivan Denisov | 6-4,6-1 |
| ITF M15 Antalya | 2023/12/03 07:00 | Ku Keon Kang v Simon Knezevic | 6-2,6-2 |
| ITF M15 Antalya | 2023/11/29 06:30 | Pol Amoros Ramos v Ku Keon Kang | 6-1,6-4 |
| ITF M15 Antalya | 2023/11/28 06:30 | Dong Ju Kim v Ku Keon Kang | 2-6,0-6 |
| ITF M15 Antalya | 2023/11/27 09:30 | Ku Keon Kang v Gabriel Schenekenberg | 6-2,6-1 |
| ITF M15 Antalya | 2023/11/26 07:00 | Ku Keon Kang v Dmitrii Vasilev | 6-2,6-4 |
| ITF M25 Changwon | 2023/06/11 07:30 | Ku Keon Kang v Jinseok Yu | 7-6,6-1 |
| ITF M15 Shymkent | 2024/04/25 04:00 | Kazuki Nishiwaki v Savva Polukhin | 2-6,0-6 |
| ITF M15 Shymkent | 2024/04/24 08:45 | Kazuki Nishiwaki v Yuichiro Inui | 7-6,6-3 |
| ITF M15 Shymkent | 2024/04/17 11:25 | Kazuki Nishiwaki v Dev Javia | 6-3,6-7,4-6 |
| ITF M15 Kashiwa | 2024/04/04 04:45 | Kazuki Nishiwaki v Ryotaro Taguchi | 3-6,4-6 |
| 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 |