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Novak Djokovic celebrates his hard fought win in men's singles quarter-final match against Jo-Wilfried Tsonga. (Getty Images)
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Jo-Wilfried Tsonga of France looks dejected after losing in men's singles quarter-final match. (Getty Images)
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Novak Djokovic held his nerve to edge past Jo-Wilfried Tsonga. (Getty Images)
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Samantha Stosur plays a backhand in her women's singles quarter-final match against Dominika Cibulkova. (Getty Images)
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Sara Errani celebrates victory after her women's singles quarter-final match against Angelique Kerber. (Getty Images)
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Bob and Mike Bryan gestures during the match. (Getty Images)
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Roger Federer plays a forehand in his men's singles quarter-final match against Juan Martin Del Potro. (Getty Images)
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Juan Martin Del Potro looks dejected during his match against Roger Federer. (Getty Images)
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Roger Federer celebrates victory in his men's singles quarter-final match against Juan Martin Del Potro. (Getty Images)
