United States's Kerron Clement finally became an Olympic 400m hurdles champion by taking gold in Rio.

The 30-year-old clocked 47.73 seconds to streak away from Kenya's Boniface Mucheru, who took silver, with Turkey's Yasmani Copello winning bronze.

Clement, who holds the seventh-fastest time ever, is twice a world champion, but managed only Olympic silver in 2008 and was eighth four years ago.

Ireland's Thomas Barr missed out on a medal in fourth place.

Barr, looking for Ireland's first track and field medal since 2000, finished strongly, only to be edged out by Copello by a margin of just 0.05 seconds.

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For Clement, the fastest time in the world this year gave him a second Olympic gold to go with the 4x400m relay title won as part of the American team eight years ago in Beijing.

Puerto Rico's Javier Culson, a bronze medallist in London, was disqualified for a false start.