HOMESTEAD, Fla. — Joey Logano busted up the Big Three and captured an improbable first NASCAR Cup Series title by soundly beating a trio of champions.

Logano won the season finale Sunday at Homestead-Miami Speedway to grab his first championship in a season in which he barely contended until the playoffs began. The year was dominated by Kyle Busch, Kevin Harvick and reigning series champion Martin Truex Jr., with Logano calling the final-four field “The Big Three and Me.”

But Logano kicked it into another gear during the playoffs, with two victories and eight top-10 finishes in 10 races. He led a race-high 80 laps Sunday, but the title was slipping away until Team Penske teammate Brad Keselowski spun Busch teammate Daniel Suarez for a race-changing caution.

Logano was fourth on the restart with 15 laps remaining but powered his way alongside leader Truex, then used a power move in the outside lane three laps later to take over the top spot.

“We were the favorite. We executed down the stretch like nobody’s business,” Logano said. “I knew we had a short-run car. I said it before the race started, that if it was anything longer than 25 laps, we were going to be in trouble. That showed all day. But it came down to the short run, and we are champions. NASCAR champions.”

Logano is the second Cup champion for Penske, the titan of motorsports who has had a banner year. Penske also this season was elected into the NASCAR Hall of Fame, won the Indianapolis 500 for a record 17th time and celebrated Team Penske’s 500th victory as an organization.

“He sure delivered for us,” Penske said. “I don’t want him to change at all. He needs to do just what he did today, beat all these guys and win fair and square.”

Truex finished second, 1.725 seconds behind, in his final race with Furniture Row Racing. The team is closing because it lost its primary sponsor midway through Truex’s championship reign.

“It’s a tough way to lose,” Truex said. “I had nothing for him at the end. That’s just the way it goes. I don’t know what else to say. It hurts a little, and I’m going to miss all of the guys.”

Harvick was third and Busch fourth as the title contenders followed each other across the finish line.

“We weren’t even close,” said Busch, who used strategy to keep up with the other title contenders.

“We were so bad tonight on the racetrack and on pit road that nothing was kind of going our way. So it was just not all there the way that we needed it to, and sometimes it all falls into place and falls your way, and other times you’ve got to be able to go out there and go earn it, and we didn’t have either.”

Busch and Harvick ended the season with eight wins each, while Truex had four.

“Lots of wins,” Busch said. “Forget about it now, move on.”