DARLINGTON, S.C. — Carl Edwards wanted momentum heading into NASCAR’s championship chase. He found it at Darlington Raceway.

Edwards rallied after falling two laps down because of a flat tire, then beat Brad Keselowski off pit road for the lead 12 laps from the end and held on for his first Southern 500 victory Sunday night.

Edwards won the Coca Cola 600 in May and had six top-10s in the past seven races. Still, he was looking for a boost that would propel his first-year Joe Gibbs Racing program into the playoffs.

“This is what we needed,” Edwards said. “We really needed a shot in the arm.”

And now Edwards heads into the chase bursting with confidence — in the entire team. He was two laps behind after this flat around Lap 90. He was in 36th place on Lap 140. But there he was at the end, pushing pole-sitter Keselowski and defending Southern 500 winner Kevin Harvick 40 laps from the end.

Crew chief Darian Grubb made strong calls throughout the night, Edwards said, and his pit crew did the job at the most crucial time.

“Everyone did their job in this one,” Edwards said after his 25th Sprint Cup victory.

Keselowski was second and Denny Hamlin finished third. Joey Logano was fourth, followed by Harvick and the Busch brothers, Kurt and Kyle.

Edwards gave Joe Gibbs Racing its seventh victory in the last 10 events. JGR swept the weekend, with Hamlin winning the Xfinity race Saturday.

Edwards did his signature victory backflip in the race’s return to Labor Day weekend.

“I guess we made it Carlington for a couple of minutes,” Edwards said after his crew taped over part of the “D” on the painted Darlington sign along a retaining wall. “This is the Southern 500. This is amazing.”

Edwards has won multiple races in season for the seventh time in 11 seasons as a fulltime driver.