| 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 XD | 2019/01/16 11:05 | Viktor Axelsen v Kazumasa Sakai | L | 2-0 |
| Indonesia Masters XD | 2018/11/14 12:45 | Jonatan Christie v Kazumasa Sakai | L | 2-0 |
| All England Open | 2018/11/08 04:50 | Kazumasa Sakai v Yuqi Shi | L | 0-2 |
| All England Open | 2018/11/07 06:15 | Suppanyu Avihingsanon v Kazumasa Sakai | W | 1-2 |
| French Open | 2018/10/25 12:40 | Kento Momota v Kazumasa Sakai | L | 2-0 |
| Osaka Int. Qual | 2019/04/03 02:30 | Guan Xun Wu v Donghun Kim | W | 0-2 |
| China Masters | 2019/03/15 11:40 | Donghun Kim v Hongyang Weng | L | 1-2 |
| China Masters | 2019/03/14 11:25 | Donghun Kim v Lanxi Lei | W | 2-0 |
| China Masters | 2019/03/13 14:00 | Donghun Kim v Su Li Yang | W | 2-1 |
| China Masters | 2019/03/12 10:40 | Donghun Kim v Ikhsan L I Rumbay | W | 2-0 |