Aries Merritt lived up to his top billing to win Olympic 110 metres hurdles gold ahead of world champion Jason Richardson in a one-two finish for the United States on Wednesday.

Merritt took control at the fifth hurdle and ran a personal and 2012 world best 12.92 seconds for victory, moving into sixth place in the all-time list. Richardson had 13.04 for silver and bronze went to Hansle Parchment of Jamaica in 13.12.

World record-holder and 2008 champion Dayron Robles of Cuba lost all chances when he seemingly injured his right hamstring midway through the race.

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