Phoenix NASCAR: Joey Logano wins, Kyle Busch seals final Chase spot

Six drivers entered the race vying for the two remaining places alongside Jimmie Johnson and Carl Edwards in the championship showdown, and any of them could have won.

Dale Earnhardt Jr's Hendrick stand-in Alex Bowman and Penske driver Logano were the early leaders, but it was on lap 256 of the planned 312 when Martin Truex Jr and Ryan Newman came together to trigger a caution and the fourth round of pitstops that the order was upset.

The frontrunners all opted for different strategies, and on the restart the six contenders vying for the final Chase spots (Logano, Matt Kenseth, the Busch brothers, Kevin Harvick and Denny Hamlin) were all in the lead pack.

In an extremely close-fought final stint, positions changed hands constantly and of the Chase cut-off protagonists only Kurt Busch never found himself in the pound seat at any point.

On what should have been the penultimate lap, Michael McDowell spun and triggered a caution and overtime.

Third-placed Kyle Busch tapped Bowman and Kenseth ahead at the restart, sending them into the Turn 1 wall and denying 2003 champion Kenseth a spot in the Homestead shootout.

That caused a final caution after which Logano held on to win from Kyle Busch.

Harvick kept the pair on edge as best he could, but couldn't quite work his way past third-placed Kyle Larson and had to concede defeat in the title race.

The result means Logano, Kyle Busch, Edwards and Johnson will be the four title contenders in next week's finale at Homestead.

RESULTS - 324 LAPS:

REMAINING TITLE CONTENDERS: