Glenn Greenwald @ggreenwald
@slipper26116816 @NickKyrgios @DaniilMedwed Serena, Osaka, Sharapova, Sloane Stevens, Madison Keys, Azarenka, Venus, Radwanska (recently retired) - has produced lots of rivalries and conflict. Before that, Hingis and, before that, obviously, Navratilova and Evert and Billie Jean King which kicked-started it all. — PolitiTweet.org