Serbia

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Britain's Andy Murray returns to Serbia's Novak Djokovic at the Sony Open Tennis tournament in Key Biscayne, Fla., Wednesday, March 26, 2014. (AP Photo/Alan Diaz)

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Novak Djokovic, of Serbia, returns to Andy Murray, of Great Britain, at the Sony Open Tennis tournament in Key Biscayne, Fla., Wednesday, March 26, 2014. (AP Photo/Alan Diaz)

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Novak Djokovic, of Serbia, returns to Tommy Robredo, of Spain, at the Sony Open Tennis tournament, Tuesday, March 25, 2014, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)