(UPDATES with quotes)
Shelly-Ann Fraser-Pryce of Jamaica became the first woman to retain the 100 meters Olympic sprint title on Saturday.
Fraser-Pryce won in 10.75 seconds, a fraction outside her personal best, with Carmelita Jeter of the United States taking silver in 10.78.
Jamaica took the bronze too, with veteran sprinter Veronica Campbell-Brown clocking 10.81 seconds.
Fraser-Pryce admitted to getting the shakes more this time around, compared to Beijing, when she led home a Jamaican 1-2-3.
"This time I was a bit nervous but I believed in God and I trusted him to carry me through," she said.
"It's completely different to Beijing because there I was inexperienced. I was young and I never believed I could win."
The race itself was a blur, Fraser-Pryce said.
"I really don't know what happened."
It was one of the fastest finals in history, with the top six runners posting sub-11 second times.
"It was a power-filled final," said second-placed Jeter.
"I'm just glad I got to the finish line. I hope I represented the USA. It was my first Olympics. I ran a season best and I got a silver."
Campbell-Brown, the 2004 and 2008 champion at 200 meters, said she was content to have a second career bronze medal.
"It was a fast race and it was good. I'm just grateful for the result and I'm not going to use any excuses. Finally I got a medal and I'm happy to be on the podium."
The job's only half-done for Fraser-Pryce, meanwhile, who is going in the 200 meters later on.
"I came here on a mission and it hasn't been completed yet. Let's see what will happen."