Davis Cup - USA v Serbia

Davis Cup - USA v Serbia
BOISE, ID - APRIL 07: Novak Djokovic of Serbia falls to the court in pain after injuring his ankle in the third game of the first set in the fourth rubber against Sam Querrey during the Davis Cup tie between the United States and Serbia at Taco Bell Arena on April 7, 2013 in Boise, Idaho. (Photo by Matthew Stockman/Getty Images)
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