Billie Jean King

You think being a Billie Jean King fan is easy? Try explaining to someone how she not only smashed tennis balls but cultural norms, too! This woman carried the torch for gender equality in her tennis whites and still had time to school anyone across the net. And let’s not start on her backhand or her die-hard fans—you’d think they won those 39 Grand Slams with her. If Billie Jean King isn't at the top of your 'Greatest Female Tennis Players of All Time' list, are you even paying attention?