Listen to this article All three NASCAR national series – Trucks, Xfinity and Cup – are running this weekend at Atlanta and all three had their scheduled practices on Friday canceled by bad weather. Because of the speedway’s recent repave and reconfiguration, NASCAR has decided it is more important for the series to have practice than qualifying. Therefore, each series will now get a 50-minute practice session on Saturday – with Trucks at 10:40 a.m. ET, Xfinity at 11:40 a.m. ET and Cup at 12:40 p.m. ET. The practices will all be broadcast live on Fox Sports 1. Each series’ starting lineup has been set by a formula spelled out in each respective rulebook. Chandler Smith will start on the pole for Saturday’s Truck race (2:30 p.m. ET, Fox Sports 1) and Noah Gragson will start on the pole for Saturday’s Xfinity race (5 p.m. ET, Fox Sports 1). Chase Brisco …