Janko Tipsarevic of Serbia lays on the court after slipping while playing Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)

Associated Press
Janko Tipsarevic of Serbia lays on the court after slipping while playing Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament,  Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)
Janko Tipsarevic of Serbia lays on the court after slipping while playing Spain's David Ferrer in the quarterfinals during the 2012 US Open tennis tournament, Thursday, Sept. 6, 2012, in New York. (AP Photo/Peter Morgan)
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