Olympic athletics: Merritt hurdles to 110m gold for US
Merritt, the world No. 1, ran a new personal best of 12.92 to cruise to the title ahead of countryman and world champion Jason Richardson.
Richardson clocked 13.04 for silver, with Hansle Parchment of Jamaica taking a surprise bronze in 13.12.
The field was weakened after Dayron Robles, Cuba's defending champion, pulled up at 50 metres, and China's 2004 gold medalist Liu Xiang hobbled out in the heats with an achilles problem.