He was driving his backup car after slamming the right side of his top car into the wall in the wake of a collision with Juan Pablo Montoya during practice Friday.
He admitted that he felt he had been "pushed around" by Montoya on the practice lap and reacted angrily. He hinted that maybe he channeled that anger into the big race.
Denny Hamlin was third, Dale Earnhardt Jr. fourth and Jeff Gordon fifth. Hamlin announced a new agreement with Joe Gibbs Racing on his Twitter account just before the start.
"It's a great day," he said. "When you know you're locked in where you're going to race for really long time, it's a good feeling. Those guys (at JGR) have given me a championship-caliber racing team."
A year after severe traffic congestion resulted in thousands of angry fans, there were few glitches after the track and government officials widened ramps and roads and added 20,000 parking spaces.
Defending champion Kyle Busch dominated for most of the first half of the race before he bumped into the wall and a broken shock absorber dropped him off the pace.
"We salvaged a heck of a finish for what all we had to go through," said Busch, who ended up 10th.
With an uncharacteristic white paint job on his Chevrolet, pole-sitter and five-time Cup champ Jimmie Johnson led at the 200-lap mark but fell back all the way to 11th due to a flat tire. He rebounded to sixth.
"Up front in clean air that thing was blistering fast," he said of his car. "I got back in traffic and just couldn't go anywhere."
Matt Kenseth, in action for the first time since announcing that he was leaving Roush Fenway Racing after the season, surged late to place seventh. Rounding out the top 10 were Martin Truex Jr., A.J. Allmendinger and Busch.
Kenseth maintained his lead in the season point standings by 11 points over Earnhardt. Keselowski is 10th.
Suddenly, Keselowski was getting questions about whether he might be able to make a run at the season title.
"We just have to keep winning," he said.
Yeah, but with which car?