Britain's Prince William (L), Catherine, Duchess of Cambridge (C) and Prince Harry (R) look on during the men's 100 metre final at the London 2012 Olympic Games in London on August 5, 2012. Jamaica's Usain Bolt sealed his status as the greatest sprinter of all time after retaining the men's Olympic 100m title with an electrifying display. The world record holder turned on the after-burners at 60m to clock an Olympic record of 9.63sec, the second fastest time in history.AFP PHOTO / CARL COURT
Jamaica's Usain Bolt celebrates after winning the gold medal in the men's 100m final at the athletics event during the London 2012 Olympic Games on August 5, 2012 in London. AFP PHOTO/ERIC FEFERBERG
Jamaica's Usain Bolt (R) celebrates with Jamaica's Yohan Blake (L) after winning the men's 100m final at the athletics event during the London 2012 Olympic Games on August 5, 2012 in London. AFP PHOTO / ADRIAN DENNIS