Elena Vesnina, of Russia, serves to Svetlana Kuznetsova, also of Russia, during a final match at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Svetlana Kuznetsova, of Russia, hits to Elena Vesnina, also of Russia, during a final match at the BNP Paribas Open tennis tournament, Sunday, March 19, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, right, hugs Jack Sock after his win a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
United States' Jack Sock hits to Roger Federer, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jack Sock hits to Roger Federer, of Switzerland during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, hits to Jack Sock during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, hits to Jack Sock during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jack Sock hits to Roger Federer, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pablo Carreno Busta, of Spain, hits to Stanislas Wawrinka, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Stanislas Wawrinka, of Switzerland, celebrates a point against Pablo Carreno Busta, of Spain, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pablo Carreno Busta, of Spain, hits to Stanislas Wawrinka, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Stanislas Wawrinka, of Switzerland, hits to Pablo Carreno Busta, of Spain, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Karolina Pliskova, of the Czech Republic, returns a shot to Svetlana Kuznetsova, of Russia, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Svetlana Kuznetsova, of Russia, returns a shot to Karolina Pliskova, of the Czech Republic, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Kristina Mladenovic, of France, returns a shot to Elena Vesnina, of Russia, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Elena Vesnina, of Russia, returns a shot to Kristina Mladenovic, of France, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jack Sock celebrates after winning a point against Kei Nishikori, of Japan, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. Sock won 6-3, 2-6, 6-2. (AP Photo/Mark J. Terrill)
Kei Nishikori, of Japan, returns a shot to Jack Sock at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Jack Sock returns a shot to Kei Nishikori, of Japan, at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Kei Nishikori, of Japan, returns a shot to Jack Sock at the BNP Paribas Open tennis tournament, Friday, March 17, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)