Wallace moved up three spots to ninth in the standings, still one below the cutoff line when this round is done.
Byron finished 1.863 seconds ahead of Chastain for his sixth win of the season, the most in the Cup series.
For the first time since Texas opened in 1997, the race wasn't scheduled for 501 miles, and was 100 miles shorter.
He finished only 73 laps and was 34th in the 36-car field, dropping from sixth to 12th in the playoff standings.
Blaney and Buescher finished second and third in that race that had 57 lead changes among 21 drivers.
Persons:
— William Byron, Texas Motor Speedway, Bubba Wallace, Chase Briscoe, Byron, Wallace, Ross Chastain, Chastain, Kyle Larson, Wallace hadn't, Larson, Ryan Blaney, Tyler Reddick, Hendrick, Denny Hamlin, Joe Gibbs, Ty Gibbs, Chris Bueshcher, Christopher Bell, BUSCH, Kyle Busch, didn't, Richard Childress, “, Something's, it's, ” Busch, Busch, Austin Dillon’s, Todd Gilliland, Ford, Blaney, Buescher
Organizations:
Texas Motor, NASCAR, Hendrick Motorsports, Texas, Chevrolet, Talladega, Richard Childress Racing Chevrolet, Talladega Superspeedway
Locations:
Texas, Charlotte