Juan Martin Del Potro of Argentina serves to Roger Federer of Switzerland in the Men's Final match during the 2009 US Open at the USTA Billie Jean King National Tennis Center, in New York, September 14, 2009. Getty Images logo Getty Images 4 months ago

Juan Martin Del Potro of Argentina serves to Roger Federer of Switzerland in the Men's Final match during the 2009 US Open at the USTA Billie Jean King National Tennis Center, in New York, September 14, 2009.