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Felix Sanchez leads the field as he wins gold. (Chris McGrath/Getty Images)

Felix Sanchez leads the field as he wins gold. (Chris McGrath/Getty Images)

LONDON, ENGLAND – AUGUST 06: Felix Sanchez of Dominican Republic races ahead of Michael Tinsley of the United States to win the gold medal in the Men’s 400m Hurdles final on Day 10 of the London 2012 Olympic Games at the Olympic Stadium on August 6, 2012 in London, England. (Photo by Chris McGrath/Getty Images)