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Wariner leads U.S. to 400 sweep, sets personal best
OSAKA, Japan -- Defending and Olympic champion Jeremy Wariner led an American sweep of the medals in the 400 meters Friday at the track and field world championships.

Wariner won in a personal best 43.45 seconds, with LaShawn Merritt taking silver in 43.96 and Angelo Taylor getting bronze in 44.32.

It was the first medal sweep for any country in the men's 400 at the world championships.

Chris Brown of Bahamas was fourth in 44.45.

The American gold rush continued in the women's 200, as Allyson Felix defended her world title.

Days after skipping the 100 meters to concentrate on the 200, Felix had all the power her competitors lacked to surge down the home stretch.

Her face intense with concentration, she let go of a big "yes" and broke into an immediate smile once she streaked across the line in a seaso