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Juan Martin del Potro holds up the Mens Championship Trophy after his 2009 US Open Mens Championship match against Roger Federer in Arthur Ashe Stadium at the Billie Jean King USTA Tennis Center in Flushing, New York on September 14, 2009. Juan Martin del Potro upsets Roger Federer in five sets by the score of 3-6, 7-6, 4-6, 7-6, 6-2 to win the 2009 US Open Mens Championship. (Photo by David Saffran/Icon SMI/Corbis/Icon Sportswire via Getty Images)

Juan Martin del Potro holds up the Mens Championship Trophy after his 2009 US Open Mens Championship match against Roger Federer in Arthur Ashe Stadium at the Billie Jean King USTA Tennis Center in Flushing, New York on September 14, 2009. Juan Martin del Potro upsets Roger Federer in five sets by the score of 3-6, 7-6, 4-6, 7-6, 6-2 to win the 2009 US Open Mens Championship. (Photo by David Saffran/Icon SMI/Corbis/Icon Sportswire via Getty Images)