Usain Bolt declared himself "the greatest athlete" to have ever lived after sealing an Olympic sprint double.

After retaining his 200m title, four days after doing the same in the 100m, he said: "I'm a living legend."

Jamaica completed a clean sweep in the 200m, with Yohan Blake winning silver and Warren Weir bronze behind Bolt's 19.32 seconds.

Although he broke neither the World nor Olympic records on this occasion, Bolt was full of joy and bravado in the post-sprint media conference, insisting he had left a permanent imprint on the sport.