Usain Bolt of Jamaica (L) takes the baton from Yohan Blake, as Darvis Patton of the US (C) falls before handing the baton to teammate Walter Dix (R), during the men's 4x100 metre relay final at the IAAF World Championships in Daegu September 4, 2011. Jamaica set a new world record with a time of 37.04 seconds. [Photo/Agencies]