| Open d'Angleterre | 09/14 09:00 | 4 | Anders Antonsen v Sakai, Kazumasa | W | 1-2 | |
| Open d'Angleterre | 09/13 11:45 | 5 | Qiao, Bin v Sakai, Kazumasa | W | 1-2 | |
| Indonesia Masters XD | 07/19 17:35 | 6 | Sakai, Kazumasa v Merrilees, Kieran | L | 0-2 | |
| Indonesia Masters XD | 07/12 00:00 | 1 | Toby Penty v Sakai, Kazumasa | L | 2-1 | |
| Giraldilla Int. XD | 06/19 23:00 | 1 | Joe, Anthony v Sakai, Kazumasa | W | 0-2 | |
| Open d'Angleterre | 06/18 08:30 | 1 | Sakai, Kazumasa v Srikanth Kidambi | L | 0-2 | |
| Open d'Angleterre | 06/17 04:50 | 2 | H.S. Prannoy v Sakai, Kazumasa | W | 1-2 | |
| Open d'Angleterre | 06/16 11:07 | - | Sakai, Kazumasa v Ouseph, Rajiv | W | 2-1 | |
| Open d'Angleterre | 06/16 09:40 | 3 | Sakai, Kazumasa v Ouseph, Rajiv | W | 2-1 | |
| Open d'Angleterre | 06/15 06:10 | 4 | Holst, Emil v Sakai, Kazumasa | W | 0-2 | |
| Open d'Angleterre | 06/14 10:20 | 5 | Chong, Wei Feng v Sakai, Kazumasa | W | 0-2 | |
| Indonesia Masters XD | 06/12 10:55 | 1 | Wei, Nan v Sakai, Kazumasa | W | 0-2 | |
| Indonesia Masters XD | 06/12 08:07 | - | Kuncoro, Sony Dwi v Sakai, Kazumasa | W | 0-2 | |
| Open d'Angleterre | 04/26 10:40 | 5 | Lee, Chong-Wei v Sakai, Kazumasa | L | 2-0 | |
| Giraldilla Int. XD | 04/11 03:50 | 1 | Heo, Kwang Hee v Sakai, Kazumasa | L | 2-0 | |
| Giraldilla Int. XD | 04/04 03:20 | 1 | Sakai, Kazumasa v Leverdez, Brice | L | 0-2 | |
| Giraldilla Int. XD | 03/30 11:30 | 1 | Kanta Tsuneyama v Sakai, Kazumasa | L | 2-0 | |
| Open d'Angleterre | 03/29 06:10 | 5 | Sakai, Kazumasa v Anders Antonsen | L | 0-2 | |
| Giraldilla Int. XD | 03/28 09:54 | - | Sakai, Kazumasa v Heo, Kwang Hee | W | 2-0 | |
| Giraldilla Int. XD | 03/28 07:00 | 1 | Sakai, Kazumasa v Joshi, Pratul | W | 2-0 | |
| California Int. Women | 03/10 18:40 | 3 | Shi, Y. Q. v Sakai, Kazumasa | L | 2-0 | |
| California Int. Women | 03/09 19:40 | 4 | Sakai, Kazumasa v Joergensen, J. O. | W | 2-0 | |
| California Int. Women | 03/08 17:40 | 5 | Sakai, Kazumasa v Wong, Wing Ki Vincent | W | 2-0 | |
| Indonesia Masters XD | 03/07 19:27 | - | Lin, Yu Hsien v Sakai, Kazumasa | W | 0-2 | |
| Indonesia Masters XD | 03/07 16:10 | - | Sakai, Kazumasa v Sameer Verma | W | 2-0 | |
| Open d'Angleterre | 02/28 19:45 | 6 | Durkinjak, Zvonimir v Sakai, Kazumasa | L | 2-0 | |
| Open d'Angleterre | 02/15 13:12 | - | Sakai, Kazumasa v Pham, Cao Cuong | W | 2-0 | |
| California Int. Women | 11/24 06:00 | 4 | Sakai, Kazumasa v Sameer Verma | L | 1-2 | |
| California Int. Women | 11/23 01:00 | 5 | Sakai, Kazumasa v Shi, Y. Q. | W | 2-1 | |
| California Int. Women | 11/16 06:10 | 5 | Sakai, Kazumasa v Guo, Kai | L | 1-2 |