London, June 26: World No.1 tennis player Novak Djokovic has said he cannot take anything for granted and needs to work harder, keeping in mind former champion Rafael Nadal's exit from the first round of
Belgrade, Serbia, Sept 15: U.S. Open champion Novak Djokovic was picked to play the opening singles match in the Davis Cup semifinals against David Nalbandian of Argentina, although he could still be replaced if he
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