| Australian Open | 2019/06/05 01:40 | Kazumasa Sakai v Cheuk Yiu Lee | W | 2-0 |
| New Zealand Open | 2019/05/02 02:40 | Zii Jia Lee v Kazumasa Sakai | L | 2-0 |
| New Zealand Open | 2019/05/01 02:00 | Zeqi Zhou v Kazumasa Sakai | W | 1-2 |
| Asia Championships | 2019/04/24 04:00 | Sameer Verma v Kazumasa Sakai | L | 2-1 |
| All England Open | 2019/03/06 16:00 | Jan O Jorgensen v Kazumasa Sakai | L | 2-0 |
| German Open | 2019/02/27 18:45 | Cheuk Yiu Lee v Kazumasa Sakai | L | 2-0 |
| Indonesia Masters | 2019/01/23 02:30 | Sitthikom Thammasin v Kazumasa Sakai | L | 2-0 |
| Indonesia Masters - Mixed double | 2019/01/16 11:05 | Viktor Axelsen v Kazumasa Sakai | L | 2-0 |
| Australian Open | 2019/06/05 01:40 | Kantaphon Wangcharoen v Kenta Nishimoto | W | 2-1 |
| Sudirman Cup | 2019/05/25 03:30 | Yuqi Shi v Kantaphon Wangcharoen | L | 2-0 |
| Sudirman Cup | 2019/05/23 10:30 | Kwang Hee Heo v Kantaphon Wangcharoen | W | 0-2 |
| Sudirman Cup | 2019/05/21 11:00 | Kantaphon Wangcharoen v Vladimir Malkov | L | 0-2 |
| Asia Championships | 2019/04/24 05:20 | Kantaphon Wangcharoen v Tien Chen Chou | L | 1-2 |
| Singapore Open | 2019/04/11 11:00 | Viktor Axelsen v Kantaphon Wangcharoen | L | 2-1 |
| Singapore Open | 2019/04/10 07:20 | Yuxiang Huang v Kantaphon Wangcharoen | W | 0-2 |
| Malaysia Open | 2019/04/04 06:10 | Long Chen v Kantaphon Wangcharoen | L | 2-0 |