DAEGU, South Korea — First the essential: Usain Bolt actually got to run this final. There was no false start, no anticlimax, no great debate, no bare-chested Bolt howling and slamming his hands against a wall as slower men took off without him.

This time, Bolt was undeniably back in the arena and undeniably back where he belonged coming out of the curve.

Bolt has not lost a 200-meter final in four years, and that streak never appeared to be in danger Saturday night at the track and field world championships. But then Bolt — after his false start and disqualification in the 100 — was determined to take no chances in the longer sprint.