The Japanese badminton brand turned to tennis with a fiberglass racquet used by Billie Jean King and Martina Navratilova in the ... in the early ’80s that Yonex really made its mark.

Two decades later, she left tennis as the queen of the game. Martina Navratilova won 56 Grand Slam championships, second only to Margaret Court. It wasn't easy for Martina Navratilova, born a ...