Doha Athletics Indoor Worlds
United States' Allyson Felix, right, crosses the finish line ahead of 2nd placed Russia's Tatyana Firova, left, and 3rd placed Jamaica's Novlene Williams-Mills in the final of the Women's 4x400m relay at the 13th IAAF World Indoor Athletics Championships in Sunday, March 14, 2010 in Doha, Qatar.(AP Photo/Hassan Ammar)
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