Wimbledon

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Novak Djokovic of Serbia returns to Jeremy Chardy of France in their Men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, June 29, 2013. (AP Photo/Sang Tan)

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Petra Kvitova of the Czech Republic celebrates after beating Ekaterina Makarova of Russia in their Women's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Saturday, June 29, 2013. (AP Photo/Anja Niedringhaus)

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Sergiy Stakhovsky of Ukraine serves to Jurgen Melzer of Austria during their Men's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Friday, June 28, 2013. (AP Photo/Sang Tan)

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Denis Kudla of United States returns to Ivan Dodig of Croatia during their Men's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 27, 2013. (AP Photo/Sang Tan)

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Bobby Reynolds of the United States wipes himself with a towel as he faces Novak Djokovic of Serbia in their Men's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 27, 2013. (AP Photo/Kirsty Wigglesworth)

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Serena Williams of the United States waves to the crowd after beating Caroline Garcia of France in their Women's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Thursday, June 27, 2013. (AP Photo/Alastair Grant)

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Sergiy Stakhovsky of Ukraine reacts after winning the third set against Roger Federer of Switzerland during their Men's second round singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 26, 2013. (AP Photo/Alastair Grant)

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Maria Sharapova of Russia waits for play to resume during her Women's second round singles match against Michelle Larcher De Brito of Portugal at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 26, 2013. (AP Photo/Anja Niedringhaus)

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Jo-Wilfried Tsonga of France is treated during his Men's second round singles match against Ernests Gulbis of Latvia at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 26, 2013. (AP Photo/Alastair Grant)

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John Isner of the United States, right, is attended to before retiring injured from his Men's second round singles match against Adrian Mannarino of France at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 26, 2013. (AP Photo/Alastair Grant)