America\'s Allyson Felix powered to victory in the women\'s 200m on Wednesday in a time of 21.88sec, denying Jamaica\'s Shelly-Ann Fraser-Pryce a 100m-200m sprint double in London. Newly-crowned 100m champion Fraser-Pryce took silver in 22.09sec with Carmelita Jeter of the United States winning bronze. Jamaica\'s Veronica Campbell-Brown, who was attempting to become the first woman to win the same individual title three times, was fourth.