AVONDALE, Ariz. — Kyle Busch defended the family name Sunday, petulantly besmirched it anew and then haltingly attempted to restore it again.
On a day when older brother Kurt Busch, the reigning Nextel Cup champion, was pulled from the race and suspended by the Roush Racing team because of a Friday night run-in with police that included a traffic violation, Kyle Busch won the Checker Auto Parts 500 at Phoenix International Raceway.
The 20-year-old rookie from Las Vegas, who won at Fontana in September, passed runner-up Greg Biffle with 27 laps to go in the 312-lap race and kept his No. 5 Kellogg's Chevrolet in front to the end for his second victory in 41 starts.
Afterward, he angrily stormed out of the interview room when a reporter challenged his assertion that "usually things in the media are false," in reference to reports of his brother's troubles.
About 25 minutes later, he returned to take more questions. "There is a lot of speculation in the media," said Kyle, who drives for Hendrick Motorsports. "The only things that are there for us to comment on are the police report and whatever Kurt Busch releases at a later time."
In his first go-round with reporters, Busch said of his ability to concentrate on the task at hand despite the controversy swirling around his brother, "You just try to put all that stuff aside and deal with it another time. This isn't the area for all that stuff. It shouldn't be at the race track. For myself, just being able to go out there and perform at my best, that's what I'm here to do week in and week out. ...
"You come in here and you get in your race car and you're focused and you're down to one duty and that's obviously to win the race."
Busch's emotional win and its untidy aftermath deflected attention from series leader Tony Stewart, who finished fourth behind Jeff Gordon on the one-mile oval and widened the gap over his closest pursuers in the Chase for the Nextel Cup.
Stewart, who won the championship in 2002, is 52 points ahead of Jimmie Johnson, who finished second in the points race in 2003 and 2004, and 87 ahead of Carl Edwards going into next Sunday's season finale at Homestead, Fla. Edwards, who had won the previous two races, finished sixth Sunday, Johnson seventh. Biffle, who is 102 points behind, is the only other driver with a mathematical chance to overtake Stewart in the race for the championship.
Though Stewart could win his second title in four seasons by finishing as low as ninth next week, he promised not to alter his approach.
"As odd as it's going to sound," he said, "we're actually going to go out and try to win the race. I know that sounds crazy, but that's really what we're going to do. The last time I checked my contract, that's what I get paid to do."
Before the race, the 35th in the 36-race series and ninth in the 10-race Chase, Roush Racing took action against Kurt Busch, abruptly ending his season. The move was made in response to Busch's being cited for criminal reckless driving and detained under suspicion of driving under the influence Friday night.
The incident near the Phoenix track was the latest controversy involving the older of the Busch brothers, whose affiliation with Roush Racing effectively ended with the suspension. Busch, 27, will race next season for Penske Racing South.
"It's the last straw for Roush Racing," team President Geoff Smith said. "We're officially retiring as Kurt Busch's apologists, effective today."
Kenny Wallace replaced Busch in Sunday's race and finished 16th after starting at the back of the field. Smith said Todd Kluever probably would drive the car next week.
Busch, who was staying in a mobile home outside the track, said in an interview with NBC Sports that alcohol was not involved in Friday's incident.
"Obviously, I'm upset," he said. "It's tough. I'm a race car driver, there's a race today and I'd love to be in the race. My crew, [crew chief] Jimmy Fennig, I have to thank them for what they gave me. Man, it's just unfortunate. I'd love to be there for them today. [But] that's the decision they made, and I will live with it."
Said team owner Jack Roush, who made the move after consulting with sponsors: "Of course, Roush Racing is embarrassed, the sponsors are embarrassed. ... We're embarrassed for all of the NASCAR community."
Sponsors, among them Crown Royal whiskey, told Roush he would be in breach of his contract if he did not take action against the driver.
"And the only action I felt I could take, and the one that was agreed upon, was to suspend him for the balance of the season," Roush said.
Busch, who won at Phoenix in April and had qualified 17th for Sunday's race, was detained at about 8:20 p.m. Friday after trying to avoid another car and running a stop sign about three miles from the track, police said.