| Hylo Open | 2021/11/03 11:00 | Koki Watanabe v Srikanth Kidambi | L | 0-2 |
| All England Open | 2021/03/17 17:00 | Koki Watanabe v Viktor Axelsen | L | 1-2 |
| Asia Team Championships | 2020/02/12 09:00 | Koki Watanabe v Kunlavut Vitidsarn | L | 1-2 |
| Thailand Masters | 2020/01/23 13:45 | Koki Watanabe v Shesar Hiren Rhustavito | L | 0-2 |
| Thailand Masters | 2020/01/22 06:00 | Koki Watanabe v Feixiang Sun | W | 2-1 |
| Indonesia Masters Qual | 2020/01/14 08:38 | Koki Watanabe v Junpeng Zhao | L | 0-1 |
| Indonesia Masters Qual | 2020/01/14 04:00 | Toby Penty v Koki Watanabe | W | 0-2 |
| Malaysia Masters | 2020/01/08 07:30 | Koki Watanabe v Ka Long Angus NG | L | 1-2 |
| Hylo Open | 2021/11/05 11:00 | Kantaphon Wangcharoen v Zii Jia Lee | L | 0-2 |
| Hylo Open | 2021/11/04 12:30 | Sourabh Verma v Kantaphon Wangcharoen | W | 0-2 |
| Hylo Open | 2021/11/03 16:05 | Brian Yang v Kantaphon Wangcharoen | W | 0-2 |
| French Open | 2021/10/26 11:20 | Kantaphon Wangcharoen v Thomas Rouxel | L | 1-2 |
| Denmark Open | 2021/10/19 07:40 | Tommy Sugiarto v Kantaphon Wangcharoen | L | 2-0 |
| Thomas Cup | 2021/10/15 06:30 | Kantaphon Wangcharoen v Yuqi Shi | L | 0-2 |
| Thomas Cup | 2021/10/13 11:30 | Kantaphon Wangcharoen v Youcef Sabri Medel | W | 2-0 |
| Thomas Cup | 2021/10/11 11:30 | Anthony Sinisuka Ginting v Kantaphon Wangcharoen | W | 1-2 |