Wayne Auton calls his final race as NASCAR Xfinity Series managing director on Saturday at Phoenix Raceway. Auton is headed for retirement and adjusting to life away from racing for the first time in decades – although he might pop up in the grandstands next season with a cold one...

NASCAR's Xfinity Series teams will have the option of running a flange-fit composite body at three races this season ahead of a full-time introduction by 2019. Teams will be permitted to run the new body at Richmond, Dover, and Phoenix, and it is expected to be optional at all non-superspeedway...