BEIJING  Usain Bolt celebrated his coronation as the world’s fastest man 20 meters early, throwing out his arms and thumping his chest. But he still obliterated the world record in the 100 meters Saturday night, turning his Olympic gold medal performance into a show of astounding talent.

Bolt could have run far faster than his 9.69 seconds had he run through the finish line, but he sliced 0.03 off his world record anyway. In the end, it was all about Bolt putting on a show for a crowd that has roared for him every time he steps on the track.

When Bolt was introduced at the start of the final, he struck a pose for the camera and smiled mischievously. He did not disappoint once the gun went off. He started strong and sailed away from the field with astonishing ease.

“I came out to make myself proud, and I did just that,” Bolt said. Of his celebration, he added: “It wasn’t planned. I wasn’t celebrating; I was excited.”