Joey Logano and Kyle Busch advanced to the championship race in Homestead after a wild finish at Phoenix International Raceway.
It was the kind of situation NASCAR officials dreamed of when they adopted the current Chase for the Sprint Cup format in 2014.
As the Can-Am 500 went into overtime at Phoenix International Raceway, four Chase drivers were among the top five in the running order, vying for two remaining Chase spots in next Sunday's championship race in Homestead.
It gets even better, though -- the lone driver mixed into that Chase pack, Alex Bowman, had dominated the race and had his sights set on his first career Sprint Cup victory.
After race leader Matt Kenseth crashed on the first overtime attempt, Logano held off Kyle Busch to claim his 17th career victory and advance to the final race. Busch, the defending series champion, also advances to the championship event. They join Jimmie Johnson and Carl Edwards, who had won in the Chase Round of 8 at Martinsville and Texas, respectively, to punch their tickets to the Championship 4.
"Man this is just so good," Logano told NBC Sports after the race. "I never felt this good about a win before. There was just so much on the line."
Kyle Larson finished third, while Chase drivers Kevin Harvick (fourth), Kurt Busch (fifth) and Denny Hamlin (seventh) will not advance.
Yet no one felt worse afterward than Kenseth, who took that first overtime attempt as the leader on the outside row with Bowman underneath. Bowman went down to try to block a pass by Kyle Busch, and Kenseth, thinking he was clear headed into the corner, went down and made contact with Bowman, sending Kenseth into the wall.
"It was a tough 15 minutes," Kenseth told NBC.