| All England Open | 10/17 15:40 | 5 | Viktor Axelsen v Kazumasa Sakai | L | 2-0 | |
| Indonesia Masters - GD | 09/27 04:20 | 4 | Kazumasa Sakai v Tien Chen Chou | L | 0-2 | |
| Indonesia Masters - GD | 09/26 03:50 | 5 | Kazumasa Sakai v Brice Leverdez | W | 2-1 | |
| All England Open | 09/19 08:30 | 5 | Kenta Nishimoto v Kazumasa Sakai | L | 2-0 | |
| All England Open | 09/11 08:00 | 5 | Kazumasa Sakai v Wan Ho Son | L | 1-2 | |
| All England Open | 07/31 10:20 | 6 | Luis Enrique Penalver v Kazumasa Sakai | - | Walkover | |
| Indonesia Masters - GD | 07/11 06:40 | 5 | Kazumasa Sakai v Wei Feng Chong | L | 1-2 | |
| All England Open | 07/05 07:15 | 4 | Yuqi Shi v Kazumasa Sakai | L | 2-0 | |
| All England Open | 07/03 08:45 | 5 | Tanongsak Saensomboonsuk v Kazumasa Sakai | W | 0-2 | |
| All England Open | 06/26 07:20 | 5 | Chong Wei Lee v Kazumasa Sakai | L | 2-0 | |
| All England Open | 05/24 13:00 | 1 | Lucas Corvee v Kazumasa Sakai | L | 2-0 | |
| Indonesia Masters - GD | 05/20 09:00 | 1 | Kazumasa Sakai v Cheuk Yiu Lee | L | 0-2 | |
| Indonesia Masters - GD | 04/25 09:20 | 5 | Kazumasa Sakai v Jonatan Christie | L | 0-2 | |
| Indonesia Masters | 01/28 05:30 | 1 | Kazumasa Sakai v Anthony Sinisuka Ginting | L | 0-2 | |
| Indonesia Masters | 01/27 08:00 | 2 | Kazumasa Sakai v Wan Ho Son | W | 2-1 | |
| Indonesia Masters | 01/26 08:00 | 3 | Kazumasa Sakai v Rasmus Gemke | W | 2-0 | |
| Indonesia Masters | 01/25 04:45 | 4 | Viktor Axelsen v Kazumasa Sakai | - | Retired | |
| Indonesia Masters | 01/24 04:20 | 5 | Sameer Verma v Kazumasa Sakai | W | 1-2 | |
| Indonesia Masters - GD | 01/17 03:40 | 5 | Kazumasa Sakai v Tzu Wei Wang | L | 1-2 | |
| All England Open | 11/24 04:00 | 3 | Kazumasa Sakai v Anders Antonsen | L | 0-2 | |
| All England Open | 11/23 10:30 | 4 | Kazumasa Sakai v H.S. Prannoy | W | 2-1 | |
| Swiss Open - Kwal. - DD | 11/22 11:15 | 5 | Viktor Axelsen v Kazumasa Sakai | - | Walkover | |
| All England Open | 11/15 04:15 | 5 | Kazumasa Sakai v Yu Hsien Lin | L | 0-2 | |
| French Open | 10/25 13:00 | 5 | Kazumasa Sakai v Yuqi Shi | L | 0-2 | |
| All England Open | 10/19 14:23 | - | Wing Ki Vincent Wong v Kazumasa Sakai | L | 2-0 | |
| Denmark Open | 10/19 12:30 | 4 | Wing Ki Vincent Wong v Kazumasa Sakai | L | 2-0 | |
| Denmark Open | 10/18 19:00 | 5 | Ygor Coelho v Kazumasa Sakai | W | 0-2 | |
| Giraldilla Int. XD | 09/19 07:06 | - | Kazumasa Sakai v Dong Keun Lee | L | 0-2 | |
| Giraldilla Int. XD | 09/19 02:18 | - | Yu Hsien Lin v Kazumasa Sakai | W | 1-2 | |
| All England Open | 09/15 06:10 | 3 | Jonatan Christie v Kazumasa Sakai | L | 2-1 |