Change Of Guard For US Track At World Championship

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MOSCOW (AP) - One year after a remarkable Olympics, an encore at the world championships was always going to be tough for the U.S. track team.

The Americans won a whopping 29 medals at the London Games, but they are refusing to predict a number for this year. Instead, they are building on a team flush with fresh faces seeking to dominate the sport for years to come.

And within the blur of a gold-filled career, Allyson Felix suddenly is a veteran at 27.

She burst onto the track scene a decade ago at the 2003 worlds in Paris.