FILE - At left, in a March 13, 2017, file photo, Angelique Kerber returns a shot during her match against Pauline Parmentier at the BNP Paribas Open tennis tournament, in Indian Wells, Calif. At right, in a May 19, 2017, file photo, Garbine Muguruza returns the ball during a quarterfinal match against Venus Williams at the Italian Open tennis tournament, in Rome. Kerber and Muguruza will be competing in the French Open. (AP Photo/File)