Jamaica's Olympic champion Usain Bolt regained the 100m world title he lost two years ago as he ran 9.77 seconds to win the final in heavy rain in Moscow.
Bolt, 26, powered past American Justin Gatlin, who took silver in 9.85 ahead of Jamaican Nesta Carter (9.95).
Britain's James Dasaolu finished in eighth place with a time of 10.21.
Bolt takes back the world crown he lost in 2011 when he was disqualified for a false start in the final, with compatriot Yohan Blake taking gold.
More to follow.