Angelo Taylor, Kerron Clement and LaShawn Merritt of the US celebrate their victory next to second placed Britain's Martyn Rooney, Robert Tobin (covered), Conrad Williams and Michael Bingham (L-R) in the men's 4x400 metres realy final during the world athletics championships at the Olympic stadium in Berlin, August 23, 2009. [Agencies]More photos: Bai Xue wins China's first gold medal from marathon