Billie Jean King has 39 Grand Slam titles to her name and 6 separate spells as world number one. She is one of the greatest female tennis players to ever grace the game – however, it is her battle for equal rights for sporting women that she will be truly remembered for. In 1973 she took on and defeated Bobby Riggs in 'The Battle of the Sexes’. A former world number one himself, Riggs' defeat proved once and for all that women deserved both respect and equality in the world of sport. She believed her actions could help improve women's rights all over the world and inspire other women to break down sexist barriers. She is currently 75 and continues to spread ideas of equality and equal rights for all.