Ross Chastain took the lead from Martin Truex Jr. on a late restart and won the NASCAR Cup Series race at Kansas Speedway on Sunday. William Byron was unable to chase down Chastain after he took the lead with 20 laps to go, though the Hendrick Motorsports driver still wound up with the best finish among the 12 to qualify for the second round of the postseason. The retiring Truex, who was eliminated last week at Bristol, finished third in what was his last race at Kansas. Ryan Blaney had a loose left wheel in the final stage but rallied to finish fourth, giving the defending champ’s postseason hopes a big boost.