DARLINGTON, S.C. (AP) — Austin Cindric has had more than six months to think about NASCAR's playoffs. The rookie racer thinks he's got a winning plan: maintain his steady, head-down approach when the 10-race postseason begins Sunday at Darlington Raceway. Cindric is among a group of four first-timers in the field of 16, along with Chase Briscoe, Ross Chastain and Daniel Suarez.