Twenty-one time Grand Slam Champion and the greatest female player ever, Serena Williams, returns to Madison Square Garden to renew a rivalry with her good friend and former world #1, Caroline Wozniacki, in the BNP Paribas Showdown on Tuesday, March 8th. In the opening match, current world #4 Stan Wawrinka will take on French star Gael Monfils as both players play their first ever match in The Garden.