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There was something in the hair in Saint-Denis, France , as Allyson Felix . 17, flipped her 'do before the quarterfinals of the 200 meters at the world championships. After finishing sixth, Felix—who in May ran the 200 in 22.11, the world's best time this year—announced she won't compete at USC, where she's a freshman, but will turn pro. Surprisingly, Don King is not expected to be her manager.