BNP Paribas Tennis Showdown (12 images)

Serena Williams returns a ball to Victoria Azarenka in the first set of their match at the BNP Paribas Showdown at Madison Square Garden in New York City on March 4, 2013. Williams defeated Azarenka in straight sets. UPI/John Angelillo

Juan Mart’n del Potro hits a forehand to Rafael Nadal at the BNP Paribas Showdown at Madison Square Garden in New York City on March 4, 2013. Nadal defeated Juan Mart’n del Potro in straight sets. UPI/John Angelillo

Rafael Nadal signs autographs after his match against Juan Mart’n del Potro at the BNP Paribas Showdown at Madison Square Garden in New York City on March 4, 2013. Nadal defeated Juan Mart’n del Potro in straight sets. UPI/John Angelillo

Rafael Nadal hits a backhand to Juan Mart’n del Potro at the BNP Paribas Showdown at Madison Square Garden in New York City on March 4, 2013. Nadal defeated Juan Mart’n del Potro in straight sets. UPI/John Angelillo