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Serena Williams  defeated Flavia Pennetta  to reach the US Open semi-final. Photograph:  Barton Silverman/The New York Times

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Ekaterina Makarova of Russia serves to Victoria Azarenka of Belarus during their US Open quarter-final match  in New York. Photograph: Mike Segar/Reuters

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Ana Ivanovic of Serbia  on her way to an upset victory over world number one Serena Williams of the USA in round four of the Australian Open in Melbourne. Photograph: Joe Castro/EPA

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Victoria Azarenka in action against Yvonne Meusburger during their third round match.

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 Serbia’s Novak Djokovic  plays a forehand in his first-round match against Lukas Lacko of Slovakia during day one of the  Australian Open in Melbourne. Photograph: Clive Brunskill/Getty Images

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 Australian Open winners Victoria Azarenka and Novak Djokovic arrive at the players draw to return their trophies. Photograph: Joe Castro/EPA

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 Andy Murray Britain shakes hands at the net with Denis Istomin after their fourth round match. Photograph: Clive Brunskill/Getty Images

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Petra Kvitova of the Czech Republic celebrates a break in serve  against Ekaterina Makarova of Russia at Wimbledon.  Photograph: Toby Melville/Reuters

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