Kazumasa Sakai (坂井一将, Sakai Kazumasa, born 13 February 1990) is a Japanese badminton player who is single specialist.

He represented Japan and won a silver medal at the 2017 Indonesia Open (badminton).

[1][2] Men's singles The BWF World Tour, announced on 19 March 2017 and implemented in 2018,[3] is a series of elite badminton tournaments, sanctioned by Badminton World Federation (BWF).

[4] Men's singles The BWF World Tour, announced on 19 March 2017 and implemented in 2018,[5] is a series of elite badminton tournaments, sanctioned by Badminton World Federation (BWF).

Men's singles Men's singles This biographical article relating to Japanese badminton is a stub.