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Daytona Beach, Fla. • Denny Hamlin is still undefeated in 2014, winning the second Daytona 500 qualifying race Thursday night as he coolly pulled away from the field as chaos erupted behind him.

Now he will attempt to become the first driver in history to sweep Speedweeks when he tries to win Sunday's season-opening Daytona 500. Hamlin also won last Saturday night's exhibition Sprint Unlimited.

"Once that snowball starts to roll, it's hard to stop it, and right now we're just on a heck of a run," said Hamlin, who closed last year with a win in the season finale.

Matt Kenseth, Hamlin's teammate at Joe Gibbs Racing, won the first Budweiser Duel 150 on Thursday night.

The Joe Gibbs Racing Toyotas were strong last season and contenders to win, but came up empty when Kenseth's engine failed while leading. Minutes later, teammate Kyle Busch's engine failed. Toyota is still looking for its first win in the "Great American Race."

JGR and the manufacturer are in great shape headed into Sunday following the strong performance Thursday in the two races, the first of which was redemption for Kenseth, who was involved in two wrecks earlier in Speedweeks.

So he felt vindicated when he nipped Kevin Harvick and Kasey Kahne at the finish line to win the first race.

"It makes up a little bit for the rest of the week — the rest of the week I haven't been very coordinated," Kenseth said. "I was kind of embarrassed walking in the garage. You feel like people are kind of looking at you cross-eyed."

While the first race was uneventful, the second race had a wild ending when defending Daytona 500 winner Jimmie Johnson ran out of gas as the field raced toward the checkered flag. It caused Jamie McMurray to run into the back of Johnson, turning Johnson sideways and both cars into the wall.

The entire pack began to spin around them, and Clint Bowyer flipped upside down. Two-time Daytona 500 winner Michael Waltrip slid through the grass and hit hard into the inside retaining wall.

"I knew he was saving gas coming to the green. It's too bad to tear cars up like that," Bowyer said. "That was one of the wildest flips I've ever had. I think we would have been just fine if I hadn't hit the grass right here."

Johnson was apologetic.

Both JGR drivers were dominant.

Kenseth led two times for 31 of the 60 laps, but Harvick pulled out on the final lap to make his bid for the victory. Then Kahne pulled out of line to make it three-wide.

But Kenseth stayed on the gas of his Joe Gibbs Racing Toyota on the top of the track and was the first car across the finish line in what fans hope was a preview of Sunday's season-opening race.