Leonardo Mayer Pictures

  • NEW YORK, NY - SEPTEMBER 02: Leonardo Mayer of Argentina serves during his men's singles third round match against Juan Martin Del Potro of Argentina during Day Seven of the 2012 US Open at USTA Billie Jean King National Tennis Center on September 2, 2012 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)