| Orleans Masters | 2023/04/06 16:00 | Jun Hao Leong v Koki Watanabe | L | 2-0 |
| Indonesia Masters | 2022/10/20 09:00 | Jun Hao Leong v Koki Watanabe | L | 2-1 |
| Thomas Cup | 2024/05/01 11:35 | Koki Watanabe v Chun-Yi Lin | W | 2-0 |
| Thomas Cup | 2024/04/29 10:45 | Koki Watanabe v Fabian Roth | W | 2-0 |
| Thomas Cup | 2024/04/28 01:55 | Koki Watanabe v Jiri Kral | W | 2-0 |
| Asia Championships | 2024/04/10 11:00 | Koki Watanabe v Cheuk Yiu Lee | L | 0-2 |
| Swiss Open | 2024/03/20 16:30 | Alex Lanier v Koki Watanabe | L | 2-1 |
| All England Open | 2024/03/15 12:35 | Koki Watanabe v Christo Popov | L | 0-2 |
| All England Open | 2024/03/14 10:55 | Toma Junior Popov v Koki Watanabe | W | 0-2 |
| All England Open | 2024/03/12 10:45 | Koki Watanabe v Tzu Wei Wang | W | 2-0 |
| Thomas Cup | 2024/04/30 09:40 | Anders Antonsen v Jun Hao Leong | L | 2-0 |
| Thomas Cup | 2024/04/27 02:05 | Jun Hao Leong v Ka Long Angus Ng | W | 2-1 |
| Spain Masters | 2024/03/29 13:15 | Tien Chen Chou v Jun Hao Leong | L | 2-0 |
| Spain Masters | 2024/03/28 14:50 | Chun-Yi Lin v Jun Hao Leong | W | 0-2 |
| Spain Masters | 2024/03/27 14:55 | Jun Hao Leong v Pablo Abian | W | 2-0 |
| Swiss Open | 2024/03/20 13:10 | Lakshya Sen v Jun Hao Leong | L | 2-1 |
| Orleans Masters | 2024/03/13 13:40 | Jun Hao Leong v Hyeok Jin Jeon | L | 1-2 |
| Thailand Masters | 2024/01/31 07:45 | S. Sankar Muthusamy Subramanian v Jun Hao Leong | L | 2-0 |