Wells

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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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)

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Nick Kyrgios, of Australia, returns a shot to Novak Djokovic, of Serbia, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Dominic Thiem, of Austria, returns a shot to Stanislas Wawrinka, of Switzerland, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Stanislas Wawrinka, of Switzerland, returns a shot to Dominic Thiem, of Austria, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Venus Williams reacts after losing a point to Elena Vesnina, of Russia, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Elena Vesnina, of Russia, returns a shot to Venus Williams at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Venus Williams returns a shot to Elena Vesnina, of Russia, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Elena Vesnina, of Russia, returns a shot to Venus Williams at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)