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