MARTINSVILLE, Va. — Martin Truex Jr. was celebrating the victory that locked him into NASCAR’s title race when he heard the crowd roar, looked up at the big screen and saw two championship contenders jawing at each other on pit road.

“Oh, look, a fight,” the winner said.

Indeed, Denny Hamlin was knocked to the ground in a confrontation with Joey Logano in the most intense action of an otherwise lackluster playoff race Sunday at Martinsville Speedway.

Truex is assured of being one of the four drivers eligible for the championship in the season finale in three weeks at Homestead-Miami Speedway after he led 464 of 500 laps on NASCAR’s shortest track.

There were just three lead changes, and Truex controlled the event from the first round of pit stops, when he beat Joe Gibbs Racing teammate Hamlin back onto the track for the lead. He was hardly challenged at all, and his Toyota coasted to his first career victory at Martinsville.

“We’re going to Homestead again, and that was what we tried to accomplish this weekend,” Truex said. “We don’t have to worry about points anymore. We can just get to work on our Homestead car.”

Martinsville marked the first of three races in the round of eight of the playoffs. Truex is locked in to the final four at Homestead, and Hamlin, Kyle Busch and Logano are above the cutline. Kevin Harvick, Ryan Blaney, Chase Elliott and Kyle Larson are the bottom four.

Elliott, NASCAR’s most popular driver, will need a win in one of the next two races to advance after he suffered a catastrophic mechanical failure and finished 36th in the 38-car field.

For Truex, the win was redemption from a year ago at Martinsville, when Logano snatched a victory away from Truex. Logano then won the championship.

“After last year, everybody wants to keep talking about last year, and I’m like ‘We’ve got work to do,”’ said Truex, the 2018 champion who will race for the title for the fourth time in five years.

As he celebrated, the crowd’s focus turned to pit road, where Hamlin and Logano were having what appeared to be a civil conversation. Hamlin wagged his finger at Logano, then Logano placed his hand on Hamlin’s shoulder somewhat flippantly as he walked away. Hamlin chased after him, crew members got in the way, and Hamlin was knocked to the ground.

Hamlin said it was how Logano typically handles confrontation.

“It was a discussion. I understand him coming over and talking, standing there and having a discussion with him, everything was fine,” Hamlin said. “I think he didn’t get me agitated enough. So he said something and then pokes a little bit and then runs away trying to get me to come so he could hide behind his guys. He’s just not that tough. And he won’t stand face to face. That’s just his style.

“It was civil and then like Joey does, he does a little push and then runs away. He said, `Do you want to go?’ I said `Yes, I’m here’ and then he runs away.”

For good measure, Hamlin did an imitation of Logano that was picked up on the big screen and brought the crowd to its feet in approval.

Logano said the incident stemmed from on-track contact when Hamlin shoved Logano into the wall and caused a cut tire.

“I just wanted to talk to him about it and was pretty frustrated. He just kind of came off the corner like there wasn’t another car on the outside of him and ruined our day. A shot at the win for sure,” Logano said. “Maybe shouldn’t have shoved him there at the end. I honestly just wanted to see what he was going to say, and he really wasn’t apologetic at all. That’s more frustrating when someone is like that, isn’t it? When someone wrecks you and he’s like, ‘Meh.’ That’s not really what I was going for there. I just wanted to see what his thoughts were, and wasn’t quite the answer I was looking for.”

William Byron and Brad Keselowski, both already eliminated from the playoffs, finished second and third.

Hamlin was fourth, followed by Blaney, another playoff contender.

Kurt Busch, eliminated from the playoffs in the first round, was sixth, followed by title contenders Harvick, Logano and Larson at his worst track in this round.

Kyle Busch had a really rough day and finished 18th, which would have been worst of the title contenders if not for Elliott’s issues.

Elliott had to start at the back of the field because of an engine change but worked his way inside the top-five until he stopped for routine service. His Chevrolet lurched as he pulled away, and he radioed in to his Hendrick Motorsports crew that he believed he had a broken axle.

Elliott returned to pit road for lengthy attempts at a repair before he finally drove his car to the garage for more intense work. It dropped him to last in the field by the end of the second stage.

Truex meanwhile, won all three stages. He took control coming off pit road during service stops under yellow in the first stage and quickly went to work lapping most of the field.

Hamlin started from the pole but had a below-average first pit stop under caution after leading the first 31 laps. He restarted fifth, with teammate Truex the new leader, and Truex was never challenged in winning his third race of these playoffs.

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