The United States maintained their vice-like grip of the men’s 4x400 metres relay on Sunday when they emphatically won their ninth world gold from the last 10 finals.
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The US, who have also won four of the last five Olympic golds, came home well clear in 2:57.31.
Quincy Hall and Vernon Norwood built an early lead before Justin Robinson, who also got a gold in the mixed 4x400 on the opening night, stretched it to give anchor Rai Benjamin a virtual lap of honour.
France took silver as a national record 2:58.45 gave them their first medal of the championships in the penultimate event.
Britain took bronze in 2:58.71, holding off back to back silver medallists Jamaica.