BELGRADE - MARCH 7: Serbian Novak Djokovic returns a ball during a match against American John Isner during DAVIS CUP SERBIA - USA, MARCH 7, 2010 in Belgrade, Serbia.Djokovic won 3-2
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BELGRADE - MARCH 7: Serbian Novak Djokovic returns a ball during a match against American John Isner during DAVIS CUP SERBIA - USA, MARCH 7, 2010 in Belgrade, Serbia.Djokovic won 3-2