Joey Logano already has clinched one of the four championship-contending spots at Homestead in two weeks.
"We have two important races here where I am in a position to run for a championship", Truex said.
"We've capitalized on a lot of race wins, a championship, put ourselves in position to win a few other championships (but it) just didn't all work out", Harvick said.
Kevin Harvick won and advanced to the championship round for the fourth time in five years.
Clint Bowyer, a title contender who started on the front row with Blaney, made contact with Denny Hamlin after sliding up on the track in the first turn on the first lap.
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NASCAR says it erred in sending Jimmie Johnson's No. 48 vehicle to back of the field for the start of the race in Texas. He nearly won last week at Martinsville to ensure the chance for a championship repeat before Joey Logano's bump-and-run move on the last lap.
Truex Jr.is the driver who Almirola trails by 57 points, and Almirola has no way of passing his point total in the Can-Am 500 without winning the race.
"That's the rule. I know people don't necessarily like all the rules, but that's the rule", O'Donnell said. Since they repaved the place it's been lights out. "Stewart-Haas" Aric Almirola also approached the top three before pitting on Lap 282.
"We don't come here to count our fingers and toes to try to figure out how we're going to make it". Today was one of those days it went with the speed and everybody executed really well.
Johnson, the seven-time NASCAR champion, has already been eliminated from this year's playoffs.
Harvick started on the inside on restarts on laps 303 and 311.
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He would have to win to overtake British Open champion Francesco Molinari. I missed a few putts, missed at least two inside eight feet.
Harvick took the top line on the restart, and after Blaney pulled slightly ahead, Harvick rocketed past him and held on for the victory.
"Had to start at the back, got to the front, hung around there for a while and then had a loose wheel there again".
The playoff chase has gone from the half-mile paperclip-shaped track at Martinsville to the high-speed 1 1/2-mile Texas layout where polesitter Ryan Blaney qualified at more than 200 miles per hour, along with Bowyer.
"I figured he wouldn't make that move three times", said Blaney.
"It was one of those things, again, a human error that we've really got to look at and look at some additional procedures we can have in place prior to Phoenix", O'Donnell said Monday on SiriusXM NASCAR Radio. "I wanted to be on the bottom to be safe, because the top got such a good side-draft getting into Turn 1 and the outside groove got rubbered up. It just didn't happen". Joey Logano is the only driver locked into the championship with his win at Martinsville Speedway last weekend, when he executed a bump-and-run on Truex on the final corner of the final lap. It gets you loose and it's a handful. "It's guaranteed if you get to Victory Lane and you're still in it [the playoffs]".
After scoring the third-place result in the second stage it appeared that Truex would be one of the drivers to contend for the overall win. Chase Elliott and Aric Almirola, who had gone to the back of the field for the start because of unapproved body modifications, rounded out the top 10.
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