U.S. sprinter Allyson Felix

Associated Press
USA's Allyson Felix celebrates their win in the Women's 4x100m Relay final at the World Athletics Championships in Daegu, South Korea, Sunday, Sept. 4, 2011. (AP Photo/Anja Niedringhaus)

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Track and field star Allyson Felix is currently vying for the final U.S. spot on the women's 100-meter Olympic team, after reaching a dead heat with Jeneba Tarmoh.

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