Busch entered Sunday's race at Las Vegas Motor Speedway as the Sprint Cup Series points leader and a contender for the victory. A blown engine ended his chances, knocking him out of the race.
Busch finished 38th to drop 13 spots to 14th in the standings. He didn't fare much better in the Nationwide Series race on Saturday, when his three-wide move sent him spinning through the grass and to a 30th-place finish after he led a race-high 84 laps.
"I've been blowing tires, mowing grass, knocking walls down and setting balls of fire down the backstretch," Busch said. "We're having problems in our hometown -- it might be good just to get out of here and come back and try again next year."
BIG DAY FOR JUNIOR: With his eighth-place finish Sunday, Dale Earnhardt Jr. was the highest finishing Hendrick Motorsports driver.
It also gave him consecutive top-10s for the first time since last summer, and moved him to 10th in the Sprint Cup standings.
KESELOWSKI MIFFED: Brad Keselowski took exception to not being interviewed by ESPN following his third-place finish in the Nationwide Series race.
The defending series champion complained on Twitter that he was ignored by ESPN, and that the network focused on Danica Patrick 's fourth-place finish.
"I said what I meant and I meant what I said," Keselowski said. "They just chose to focus on only a few storylines during the race, and when I got out of the car, it was clear I wasn't one of those storylines. They said they tried to find me, but I was hiding in plain sight. Nobody ever showed up to talk to me."