Kyle Busch heard the critics who said he was too good, too dominant, too loaded with the best equipment to keep dropping down levels and routinely romping his way toward victories.

His response from Victory Lane, too bad.

Busch raced to his second victory of the weekend at Dover, Delaware, taking the checkered flag Saturday in the Nationwide Series race to set himself up for a tripleheader sweep.

"I do it for the pure love of the sport and just wanting to be out there," Busch said. "I'll keep doing it as long as we can do it."

Busch followed his dominant win Friday night in the Truck Series with another stellar run in Nationwide. He led 124 of 200 laps for his 66th career victory in NASCAR's second-tier series. He has 134 wins spread over NASCAR's three major series, though he has yet to win a Cup championship or marquee races such as the Daytona 500, Brickyard 400, Coca-Cola 600 or All-Star race.

"I've got a 134 of 'em now, and none of them mean nothing," Busch said. "Hopefully, someday, the big ones come."

Busch had a three-race sweep in 2010 at Bristol, which he called the highlight of his career. He'll start second behind pole-winner Brad Keselowski on Sunday in the 400-mile Sprint Cup race. Busch has one Cup victory this season.

The only driver to sweep a weekend, Busch has been in this position before, but is just 1 for 8 in Cup races after winning the first two.

"It seems like the last one is always the hardest one," he said. "That's due to just the competition."

Former Daytona 500 champion Trevor Bayne was second. Bayne finished strong a week after he reached a deal to race full time next season for Roush Fenway Racing. Joey Logano, Matt Kenseth and Chase Elliott round out the top five. Series points leader Regan Smith was 10th.

IndyCar: Will Power gave Roger Penske and Chevrolet what they desperately wanted by winning the first of two races at the Detroit Grand Prix.

"On his home track and in Chevy's backyard, it's a perfect day," Power said Saturday. "If we can do it again tomorrow, it'll be even better."

Power finished 0.3308 seconds ahead of Graham Rahal on the bumpy, 13-turn, 2.36-mile street circuit on Belle Isle.

He started a season-worst 16th and took the lead for good with just more than 10 laps to go when he passed Ryan Briscoe.

"There's no way we thought we would come from 16th to win," he said. "But this is IndyCar, and anything can happen."

The Australian held off Rahal to join Indianapolis 500 champion Ryan Hunter-Reay as the series' drivers with two victories through six races. Power pulled within three points of Hunter-Reay, IndyCar's points leader.

Tony Kanaan was a season-best third followed by Justin Wilson and Castroneves, who was the pole-sitter and led a race-high 30 laps Saturday.

"I wish I could relax," Kanaan said "My mind is already going on what I have to do tomorrow."

Hunter-Reay, meanwhile, failed to follow up the biggest win of his career with a 16th-place finish. He was on the last lap but did not make it to the finish line because he spun into a tire wall to end the race. He started 21st in the 22-car field because he brushed a wall on his second lap during Saturday morning's qualifying session.

NHRA: Cruz Pedregon topped Funny Car qualifying in the NHRA Summernationals, with his Friday run holding up at Old Bridge Township Raceway Park in Englishtown, New Jersey.

Pedregon powered his Toyota Camry to a track-record performance of 3.959 seconds at 310.48 mph to lead Friday. Pedregon's time, the quickest ever in the 10,000-horsepower category, will be certified as an NHRA national record if he can post a time of 3.999 seconds or quicker Sunday.

Doug Kalitta took the No. 1 spot in Top Fuel, Allen Johnson topped the Pro Stock lineup, and Eddie Krawiec held the lead in Pro Stock Motorcycle.