MOSCOW » When Usain Bolt means business, he is still all alone out there.

Bolt coasted to his third straight 200-meter world title with the race basically wrapped as soon as he entered the finishing straight today.

Jamaican teammate Warren Weir never got close to Bolt’s world-leading mark 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 4×100 relay 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 late on the closing day of the championships.

Opposition could hardly touch Bolt today, and once it was clear his right foot was OK 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.