The Olympic silver medallist beat Puerto Rico's Javier Culson who clocked 48.09, while 2005 world champion Bershawn Jackson was third in 48.23.
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The American finished in 48.43 to edge London bronze medalist Javier Culson.
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Kerron Clement of the United States took gold in the men's 400m hurdles with a time of 47.91, ahead of Puerto Rico's Javier Culson (48.09) and American Bershawn Jackson (48.23).
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