Novak Djokovic, from Serbia, gives a thumbs-up to the crowd after receiving the runner-up trophy following the men's final at the Western & Southern Open tennis tournament, Sunday, Aug. 21, 2011 in Mason, Ohio. Djokovic retired with a shoulder injury and Andy Murray leading 6-4, 3-0. (AP Photo/Al Behrman)

Associated Press
Novak Djokovic, from Serbia, gives a thumbs-up to the crowd after receiving the runner-up trophy following the men's final at the Western & Southern Open tennis tournament, Sunday, Aug. 21, 2011 in Mason, Ohio. Djokovic retired with a shoulder injury and Andy Murray leading 6-4, 3-0. (AP Photo/Al Behrman)
Novak Djokovic, from Serbia, gives a thumbs-up to the crowd after receiving the runner-up trophy following the men's final at the Western & Southern Open tennis tournament, Sunday, Aug. 21, 2011 in Mason, Ohio. Djokovic retired with a shoulder injury and Andy Murray leading 6-4, 3-0. (AP Photo/Al Behrman)
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