Chastain took the field three-wide on a restart with 16 of 267 laps to move into the lead but Logano – among a group of cars that had pit for new tires during the previous caution – was coming up fast through the field.
Logano finally caught Chastain with two laps to go and easily made his way around him to reclaim the lead and held on by 0.817 seconds for the victory.
With the win, Logano automatically advances to the Championship 4 at Phoenix and will compete for the 2022 series title regardless of how he finishes in the next two races – next weekend at Homestead, Fla., and Oct. 30 at Martinsville, Va.
The driver who has won the first race of the semifinal round of the playoffs has gone on to win the championship in three of the last four seasons.
“We’re running for a championship – let’s go,” Logano said after exiting his No. 22 Ford. “The Penske cars were all really fast today. All you want to do is get to the Championship 4 when the season starts and race for a championship and we’ve got the team to do it. I don’t see why we can’t win at this point.
“Things are looking really good for us, and man, just a lot of adversity fought through the last 50 laps or so. I thought we were going to win and then we kind of fell out and then had the tires, and racing Ross was fun.
“He was doing a good job air blocking me, and just trying to be patient, and eventually I was like, ‘I’ve got to go here.’ Just great to win out here in Vegas again, and it means so much getting to the championship.”
Kyle Busch finished third, Chase Briscoe rebounded from a lap down to finish fourth and Denny Hamlin rounded out the top-five.
Completing the top-10 were Tyler Reddick, Martin Truex Jr., Erik Jones, A.J. Allmendinger and Austin Dillon.
With two races remaining in the semifinal round of the playoffs, the four drivers lowest in points and in danger of elimination are William Byron, Briscoe, Ryan Blaney and Christopher Bell.
Both Blaney and Bell were involved in wrecks in Sunday’s race.
Stage 3
During the break between Stages 2 and 3, the lead-lap cars all pit with Logano first off pit road. Ty Gibbs was penalized for speeding on pit road and had to restart from the rear of the field. Daniel Suarez was forced to pit twice to tighten a wheel.
When the race returned to green on Lap 172, Logano led the way followed by Hamlin, Blaney and Chastain.
J.J. Yeley spun off Turn 4 and slid into the frontstretch on Lap 194…
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