Tommy Haas, of Germany, returns the ball to Novak Djokovic, of Serbia, at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla., Tuesday, March 26, 2013. Haas defeated Djokovic 6-2, 6-4. (AP Photo/Luis M. Alvarez)

Associated Press
Tommy Haas, of Germany, returns the ball to Novak Djokovic, of Serbia, at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla., Tuesday, March 26, 2013. Haas defeated Djokovic 6-2, 6-4.  (AP Photo/Luis M. Alvarez)
Tommy Haas, of Germany, returns the ball to Novak Djokovic, of Serbia, at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla., Tuesday, March 26, 2013. Haas defeated Djokovic 6-2, 6-4. (AP Photo/Luis M. Alvarez)
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