Serbia's Novak Djokovic celebrates after defeating Ukraine's Alexandr Dolgopolov during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. Djokovic beat Dolgopolov 6-1, 6-4 and advanced to the quarterfinals. (AP Photo/Andrew Medichini)

Associated Press
Serbia's Novak Djokovic celebrates after defeating Ukraine's Alexandr Dolgopolov during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. Djokovic beat Dolgopolov 6-1, 6-4 and advanced to the quarterfinals. (AP Photo/Andrew Medichini)
Serbia's Novak Djokovic celebrates after defeating Ukraine's Alexandr Dolgopolov during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. Djokovic beat Dolgopolov 6-1, 6-4 and advanced to the quarterfinals. (AP Photo/Andrew Medichini)
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