Lucie Safarova, of the Czech Republic, returns a shot to Venus Williams at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Stanislas Wawrinka, of Switzerland, returns a shot to Philipp Kohlschreiber, of Germany, at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Venus Williams returns a shot to Lucie Safarova, of the Czech Republic, at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Angelique Kerber, of Germany, reacts after beating Pauline Parmentier, of France, during the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Angelique Kerber, of Germany, serves to Pauline Parmentier, of France, at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pauline Parmentier, of France, returns a shot to Angelique Kerber, of Germany, at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Angelique Kerber, of Germany, returns a shot to Pauline Parmentier, of France, at the BNP Paribas Open tennis tournament, Monday, March 13, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Novak Djokovic, of Serbia, hits to Kyle Edmund, of Britain, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Kyle Edmund, of Britain, reaches for a shot from Novak Djokovic, of Serbia, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Novak Djokovic, of Serbia, hits to Kyle Edmund, of Britain, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Kayla Day serves against Garbine Muguruza, of Spain, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Garbine Muguruza, of Spain, waves after her win against to Kayla Day at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Rafael Nadal, of Spain, hits to Guido Pella, of Argentina, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Rafael Nadal, of Spain, celebrates his win against Guido Pella, of Argentina, at the BNP Paribas Open tennis tournament, Sunday, March 12, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Serena Williams (right) has returned to Indian Wells, California, where in 2001 she was taunted when she won a semifinal match against sister Venus when and injury forced Venus to withdraw. (Associated Press)