LONDON  - Usain Bolt declared himself the greatest athlete of all time on Thursday after storming to victory in the Olympic Games 200m to seal an unprecedented second successive sprint double. "It's what I came here to do. I'm now a legend, I'm the greatest athlete to live," said Bolt, who led a Jamaican clean sweep of the medals, ahead of Blake and Warren Weir. "I did what I wanted," Bolt said. "I came out of a rough season and I did what I had to do. I've got nothing left to prove. I've showed the world I'm the best. It's wonderful. Jamaica has proven that we are the greatest sprint country."