World Championships: US reassert authority in men's 4x400m relay

The United States comfortably won the men's 4x400 metres relay gold at the world championships on Sunday, reasserting their authority in the event and ensuring they finished top of the medals table. Rai Benjamin, silver medallist in the 400m hurdles, completed the win as he held off Jamaica's Demish Gaye around the final leg as the U.S won in 2:56.69 in the very last event of the championship.