RICHMOND, Va. -- Justin Allgaier didn't panic when a late caution made a more than nine-second lead evaporate. The way he figured, he'd pulled away once and could do it again. Allgaier grabbed control again on a restart with 13 laps to go to complete a sweep of a NASCAR Xfinity series doubleheader weekend at Richmond Raceway on Saturday.
"I knew how good our car was all day," Allgaier said after his third victory of the season, all coming in the past six races. "I knew we had speed, and I knew when we needed to go, we could."
Allgaier, who lost the lead when he had trouble on a previous restart, had no such issues starting on the inside with teammate Jeb Burton to his outside and Ross Chastain behind him. He quickly moved in front and pulled away in a dominant performance.
The weekend sweep came after he arrived at Richmond winless in 18 prior starts.
Austin Cindric never contended but clinched the regular-season championship.
"I had a very frustrating day," he said, noting that when his team gathered before the season, each member set three goals.
"My No. 1 was the regular-season championship," he said. "From the outside looking in, maybe that was a lofty goal, but we've got a lot of speed and a lot of fight and I'm really proud of that effort."
Cindric ran up front on Friday night but was less of a factor on Saturday.
"We can't have days like today, especially if we get to make it to the Championship 4," he said of the series playoffs, which start after the next race at Bristol on Friday. "A lot of emotions right now, but at the end of the day, it is mission accomplished for sure."
The finish was a career-best for Burton, who is driving part time this season.
"Being that close, I wish I could have stayed on [Allgaier's] door maybe a little bit better. I think I could have ran side by side with him for a couple laps, but he was better." he said.
The late caution came because of an incident between Herbst and Brandon Brown. By then, Allgaier had sailed to a lead of more than 9.4 seconds, or the complete backstretch of the 0.75-mile, D-shaped Richmond oval.
Allgaier, who led three times for 135 laps, won the 75-lap first stage after passing Noah Gragson with 29 laps to go in the stage. It was his 10th stage win of the season, tying him with Cindric for the series lead. He almost won the second stage, too, after leading most of the way, but Chastain used a late caution to stop for tires while Allgaier stayed on the track, and Chastain led a parade that easily zipped by Allgaier under a green flag.