Wimbledon

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Switzerland's Roger Federer speaks next to the Men's Single's tennis trophy he won on Sunday during a photo call at The All England Lawn Tennis and Croquet Club, Wimbledon, England, Monday July 17, 2017. Federer's eighth Wimbledon title pushed him back up to No.3 in the ATP rankings. (Adam Davy/PA via AP)

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Switzerland's Roger Federer speaks next to the Men's Single's tennis trophy he won on Sunday during a photo call at The All England Lawn Tennis and Croquet Club, Wimbledon, England, Monday July 17, 2017. Federer's eighth Wimbledon title pushed him back up to No.3 in the ATP rankings. (Adam Davy/PA via AP)

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FILE - In this July 5, 2014, file photo, Petra Kvitova, of Czech Republic, holds the trophy after winning the women's singles final against Eugenie Bouchard at the All England Lawn Tennis Championships in Wimbledon, London. Kvitova still has not regained full strength in her left hand, the one she uses to swing a tennis racket _ and the one that was stabbed by an attacker at her home in December. The two-time Wimbledon champion is simply thrilled to be back on tour, and she's seen as a serious title contender on the grass on which she excels.(AP Photo/Sang Tan, File)

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Tennis super stars Serena Williams and Novak Djokovic at the Post-Wimbledon ball in 2015

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ADVANCE FOR WEEKEND EDITIONS, AUG. 29-30 - FILE - In this June 28, 2014, file photo, Alize Cornet of France plays a return to Serena Williams during their women's singles match at the All England Lawn Tennis Championships in Wimbledon, London. Cornet beat Serena Williams at Wimbledon last year. (AP Photo/Sang Tan, File)

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Serena Williams of the United States returns a shot to Garbine Muguruza of Spain, during the women's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Saturday July 11, 2015. (AP Photo/Kirsty Wigglesworth)

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Serena Williams of the United States talks during a press conference after defeating Garbine Muguruza of Spain in the final of the women's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, July 11, 2015. (Javier Garcia/Pool Photo via AP) ** FILE **

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Serena Williams of the United States returns a shot to Garbine Muguruza of Spain during the women's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Saturday July 11, 2015. (Sean Dempsey/Pool Photo via AP)

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Serena Williams of the United States returns a shot to Maria Sharapova of Russia, during the women's singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday July 9, 2015. (AP Photo/Pavel Golovkin)

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Serena Williams of the United States returns a shot to Maria Sharapova of Russia during the women's singles semifinal match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday July 9, 2015. (AP Photo/Alastair Grant)

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Andy Murray of Britain shouts after a point as he plays Vasek Pospisil of Canada, during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday July 8, 2015. (AP Photo/Alastair Grant)

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Serena Williams of the United States celebrates winning a point againstVictoria Azarenka of Belarus during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 7, 2015. (AP Photo/Pavel Golovkin)

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Maria Sharapova of Russia returns a ball to Coco Vandeweghe of the United States during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday July 7, 2015. (AP Photo/Pavel Golovkin)

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Rafael Nadal of Spain walks after losing the singles match against Dustin Brown of Germany, at the All England Lawn Tennis Championships in Wimbledon, London, Thursday July 2, 2015. (AP Photo/Pavel Golovkin)

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Venus Williams of the United States returns a shot to Yulia Putintseva of Kazakhstan during their singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday July 1, 2015. (AP Photo/Pavel Golovkin)

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Venus Williams of the United States celebrates winning the women's singles first round match against Madison Brengle of the United States at the All England Lawn Tennis Championships in Wimbledon, London, Monday June 29, 2015. (AP Photo/Tim Ireland)

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Eugenie Bouchard of Canada leaves the court after losing to Ying-Ying Duan of China in the singles first round match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday June 30, 2015. (AP Photo/Pavel Golovkin)

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Kiki Bertens of the Netherlands returns a ball to Petra Kvitova of the Czech Republic during the singles first round match at the All England Lawn Tennis Championships in Wimbledon, London, Tuesday June 30, 2015. (AP Photo/Tim Ireland)

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Serena Williams of the United States celebrates a point during the women's singles first round match against Margarita Gasparyan of Russia at the All England Lawn Tennis Championships in Wimbledon, London, Monday June 29, 2015. (AP Photo/Pavel Golovkin)