Wimbledon

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Roger Federer reacts after winning a set against Novak Djokovic of Serbia during a semifinals match at the All England Lawn Tennis Championships at Wimbledon, England, Friday, July 6, 2012. (AP Photo/Anja Niedringhaus)

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Roger Federer waves to spectators after defeating Novak Djokovic in the semifinals match at Wimbledon on July 6, 2012. (Associated Press)

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Serena Williams celebrates after defeating Victoria Azarenka in the Wimbledon semifinals on July 5, 2012, in Wimbledon, England. (Associated Press)

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Serena Williams put away defending Wimbledon champion Petra Kvitova 6-3, 7-5 to set up a semifinal match with Victoria Azarenka on Thursday. (Associated Press)

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Serena Williams of the United States reacts winning against Petra Kvitova of the Czech Republic during a quarterfinals match at the All England Lawn Tennis Championships at Wimbledon, England, Tuesday, July 3, 2012. (AP Photo/Anja Niedringhaus)

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Serena Williams of the United States follows the ball during a quarterfinals match against Petra Kvitova of the Czech Republic at the All England Lawn Tennis Championships at Wimbledon, England, Tuesday, July 3, 2012. (AP Photo/Anja Niedringhaus)

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Maria Sharapova of Russia reacts during a fourth round singles match against Sabine Lisicki of Germany at the All England Lawn Tennis Championships at Wimbledon, England, Monday, July 2, 2012. (AP Photo/Sang Tan)

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Andy Murray reacts after defeating Marcos Baghdatis during a third-round men's singles match against at the All England Lawn Tennis Championships at Wimbledon, England, on Saturday, June 30, 2012. (AP Photo/Anja Niedringhaus)

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Marin Cilic after defeating Sam Querrey in a third-round men's singles match at the All England Lawn Tennis Championships at Wimbledon, England, on Saturday, June 30, 2012. (AP Photo/Kirsty Wigglesworth)

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Serena Williams reacts to a point against Zheng Jie during a third-round women's singles match at the All England Lawn Tennis Championships at Wimbledon, England, on Saturday, June 30, 2012. (AP Photo/Anja Niedringhaus)

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Roger Federer reacts after winning a third-round men's singles match against Julien Benneteau at the All England Lawn Tennis Championships at Wimbledon, England, on Friday, June 29, 2012. (AP Photo/Alastair Grant)