When Usain Bolt means business, he is still all alone out there.
Bolt coasted to his third straight 200-meter world title on Saturday with the race basically wrapped as soon as he entered the finishing straight.
Jamaican teammate Warren Weir never got close to Bolt's world leading time of 19.66 seconds, but crossing .13 seconds later for silver still left him enough time to join Bolt in a reggae dance to Bob Marley's 'Three Little Birds.'
Curtis Mitchell of the United States took bronze in 20.24 seconds, but was never in the hunt for gold.
Now Bolt will go for his fourth triple gold at a major championship when he joins the Jamaican team for the 4x100 relay on Sunday.
The wealth of Jamaican sprinting is such that they might well sweep their American rivals in unprecedented fashion, after Shelly-Ann Fraser-Pryce clinched a similar 100-200 double and has her final relay also late on the closing day of the championships.
Opposition could hardly touch Bolt on Saturday, and once it was clear his right foot was okay after he dropped a starting block on it early in the week, everything was as good as gold.
Even his start was strong as he quickly gained a decisive edge.
In the finishing straight, Bolt fully let loose his giant stride, the one that has dumbfounded rivals since he won three gold medals at the 2008 Beijing Olympics.
Away from Bolt mania, America's new kid on the block Brianna Rollins dethroned Australia's 100 metres hurdles queen Sally Pearson to win gold.
Rollins, who celebrates her 22nd birthday on Sunday, was last out of the blocks but had drawn level with defending champion Pearson by the ninth barrier and edged ahead of the Australian over the last to win in 12.44 seconds.
Olympic champion Pearson, who was plagued by a hamstring injury earlier in the season, finished second in 12.50.
Britain's Tiffany Porter was quickest out of the blocks and ran well to finish third in a personal best 12.55.