Jamaica won the men's Olympic 4x100m relay on Saturday in a new world record of 36.84sec. The quartet of Nesta Carter, Michael Frater, Yohan Blake and Usain Bolt beat their previous record of 37.04sec set in the 2011 worlds in Daegu. The United States claimed silver in a national record of 37.04sec, with Trinidad and Tobago taking bronze in 38.12sec.