U.S. Open: Juan Martin del Potro rallies past Marin Cilic to reach semifinals September 10, 2009 Contributor Juan Martin del Potro advanced to his second Grand Slam semifinal with a 4-6, 6-3, 6-2, 6-1 victory over Marin Cilic at the U.S. Open. Share this:TweetEmailPrintLike this:Like Loading... Related