The U.S. ran without top 400-meter runner LaShawn Merritt, who pulled out of the Olympics during qualifying rounds last week.

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After gold-medal favorite LaShawn Merritt pulled a hamstring in Saturday's preliminaries, Tony McQuay and Bryshon Nellum took to the track Sunday for their semifinal heats.

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Beijing Olympic gold medalist LaShawn Merritt won the men's 400 in 44:32, and Jamaican Nickel Ashmeade ran the 200 in 20:14 to best Walter Dix in 20:16.

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