NASCAR Cup Series' Championship Four set after Martinsville race ends in controversy

Blaney was ecstatic as he pounded the hood of his Ford in celebration.

Christopher Bell thought he secured the final spot. He passed Bubba Wallace and hit the wall in the final turn but secured the 18th spot and the point he needed to get past William Byron and earn the final spot.

Bell appeared to get loose and hit the wall, but he continued to drive along the wall for a few feet before coming off it and finishing the race. Byron said that regardless of whether Bell meant to or not, he rode the wall.

NASCAR officials determined that Bell violated safety rules and Byron was awarded the final spot in the Championship Four. 

Bell was left stunned.

Blaney and Byron now join Joey Logano and Tyler Reddick at Phoenix International Raceway for a chance at a title.

Logano was the first driver to clinch a spot in the Championship Four when he won in Las Vegas. There was no need for pressure in the final few races to determine that final spot.

Reddick will be in the Championship Four for the first time. He came from third place to first place in the final moments at Homestead-Miami to win and clinch a spot in the finals.

Blaney is the defending champion. He finished second at Phoenix at the end of last season. Larson, Bell and Byron all competed against him.