United States' Allyson Felix, third left, leads the field to win the women's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Daniel Ochoa De Olza)
United States' Allyson Felix, third left, leads the field to win the women's 200-meter final during the athletics in the Olympic Stadium at the 2012 Summer Olympics, London, Wednesday, Aug. 8, 2012. (AP Photo/Daniel Ochoa De Olza)