Janko Tipsarevic of Serbia returns a shot to Spain's David Ferrer during the quarterfinals of the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Associated Press
Janko Tipsarevic of Serbia returns a shot to Spain's David Ferrer during the quarterfinals of the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)
Janko Tipsarevic of Serbia returns a shot to Spain's David Ferrer during the quarterfinals of the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)
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