Janko Tipsarevic Pictures

  • NEW YORK, NY - AUGUST 31: Janko Tipsarevic of Serbia returns a shot to Jack Sock of the United States during their men's singles third round match on Day Six of the 2013 US Open at USTA Billie Jean King National Tennis Center on August 31, 2013 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)