Lucie Šafářová

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Caroline Wozniacki, of Denmark, waves at the crowd after defeating Lucie Safarova, of the Czech Republic, 6-4, 6-3 during the Miami Open tennis tournament, Tuesday, March 28, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)

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Lucie Safarova, of the Czech Republic, prepares to return a shot to Daria Gavrilova, of Australia, during a tennis match at the Miami Open, Thursday, March 23, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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Lucie Safarova, of the Czech Republic, returns a shot from Daria Gavrilova, of Australia, during a tennis match at the Miami Open, Thursday, March 23, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)

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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)

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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)

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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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Petra Kvitova of Czech Republic celebrates after defeating Lucie Safarova of Czech Republic in their women’s singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, July 3, 2014. (AP Photo/Ben Curtis)

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Lucie Safarova of the Czech Republic celebrates winning her third round match of the French Open tennis tournament in two sets, 6-3, 6-3, against Serbia's Ana Ivanovic at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)