Peng Shuai

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Peng Shuai, of China, returns a shot to Venus Williams at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Venus Williams returns a shot to Peng Shuai, of China, at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)

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Lucie Safarova, left, of the Czech Republic and partner Bethanie Mattek-Sands, second from left, of the U.S. pose with their trophy after defeating Andrea Hlavackova , right, of the Czech Republic and Peng Shuai of China in the women's doubles final at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 27, 2017.(AP Photo/Aaron Favila)

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Peng Shuai, of China, reacts after defeating Belinda Bencic, of Switzerland, during the quarterfinals of the 2014 U.S. Open tennis tournament, Tuesday, Sept. 2, 2014, in New York. (AP Photo/Mike Groll)

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Sloane Stephens, of the U.S, returns the ball to China's Peng Shuai during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Sloane Stephens, of the U.S, returns the ball to China's Peng Shuai during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Sara Errani, of Italy, reacts to Peng Shuai, of China, during the Family Circle Cup tennis tournament in Charleston, S.C., Thursday, April 3, 2014. (AP Photo/Mic Smith)

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Peng Shuai, of China, returns to Sara Errani, of Italy, during the Family Circle Cup tennis tournament in Charleston, S.C., Thursday, April 3, 2014. (AP Photo/Mic Smith)

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Sara Errani, of Italy, returns to Peng Shuai, of China, during the Family Circle Cup tennis tournament in Charleston, S.C., Thursday, April 3, 2014. (AP Photo/Mic Smith)