FORT WORTH, Texas -- Kyle Busch was just trying to maintain the pace behind Martin Truex Jr. while waiting for his chance.
The No. 18 Joe Gibbs Racing team pounced when the yellow flag came out with 21 laps to go at Texas Motor Speedway.
Busch finally regained the lead on pit road during that caution then held on for the final 16 laps after the last restart Saturday night in the Sprint Cup race, completing a NASCAR weekend sweep.
"As soon as that caution came, my boys stepped up the plate and hit a grand slam," said Busch, who got his 26th career cup win in his 300th start.
After following Truex lap after lap, Busch came off pit road first and charged his Toyota forward in a strong restart.
It was the second time this season, and a NASCAR-record seventh time in his career, that Busch won Cup and Nationwide races in the same weekend. He was the polesitter Saturday night, and won the Nationwide race on Friday night on the 1½-mile, high-banked track.
Busch, who also won both races at Fontana last month, led eight times for 171-of-334 laps. He is the first driver to win in all three series at Texas, with six Nationwide wins and two in trucks.
"To be in Victory Lane in Texas, there's nothing better," Busch said. "If it wasn't for my pit crew, which is the most awesome group ever. ... Man, those guys were just awesome. They put together a heck of a stop to give us that lead. These cars are amazing to drive. They're fast. They're fun."
Truex was trying to win for the first time since June 2007, but his winless streak reached 210 races when he finished a half-second behind Busch. Truex came into the race 25th in points with no laps led this season, but had his Michael Waltrip Racing Toyota in front for 142 laps at Texas.
"Debris huh????" Truex tweeted about the caution that cost him the lead.
Truex had more than a 4-second lead over Busch soon before pulling in for a green-flag stop on lap 281 just before two cars spun on the backstretch bringing out a caution. Truex had pushed back to a 1.3-second lead just before that last yellow flag that determined the race.
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