| Open d'Angleterre | 2019/03/06 16:00 | Joergensen, J. O. v Sakai, Kazumasa | L | 2-0 |
| German Open | 2019/02/27 18:45 | Cheuk Yiu Lee v Sakai, Kazumasa | L | 2-0 |
| Indonesia Masters | 2019/01/23 02:30 | Thammasin, S. v Sakai, Kazumasa | L | 2-0 |
| Indonesia Masters XD | 2019/01/16 11:05 | Viktor Axelsen v Sakai, Kazumasa | L | 2-0 |
| Indonesia Masters XD | 2018/11/14 12:45 | Jonatan Christie v Sakai, Kazumasa | L | 2-0 |
| Open d'Angleterre | 2018/11/08 04:50 | Sakai, Kazumasa v Shi, Y. Q. | L | 0-2 |
| Open d'Angleterre | 2018/11/07 06:15 | Avihingsanon, Suppanyu v Sakai, Kazumasa | W | 1-2 |
| Open de France | 2018/10/25 12:40 | Kento Momota v Sakai, Kazumasa | L | 2-0 |
| Osaka Int. Qual | 2019/04/03 02:30 | Wu, Guan Xun v Kim, Donghun (1993) | W | 0-2 |
| China Masters | 2019/03/15 11:40 | Kim, Donghun (1993) v Weng, H. Y. | L | 1-2 |
| China Masters | 2019/03/14 11:25 | Kim, Donghun (1993) v Lei, L. X. | W | 2-0 |
| China Masters | 2019/03/13 14:00 | Kim, Donghun (1993) v Su, L. Y. | W | 2-1 |
| China Masters | 2019/03/12 10:40 | Kim, Donghun (1993) v Ikhsan L I Rumbay | W | 2-0 |