Billie Jean King

Billie Jean King won 39 Grand Slam titles across singles, doubles, and mixed doubles, and her 1973 victory over self-proclaimed male chauvinist Bobby Riggs in the Battle of the Sexes watched by 90 million people worldwide became the most-watched tennis match in history and a landmark moment for womens rights. She founded the Womens Tennis Association in 1973 and the Womens Sports Foundation in 1974.