U.S. sprinter Allyson Felix

Associated Press
Allyson Felix reacts with her gold medal for the Women's 4x400m Relay 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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