There's been a much different vibe to this season in the Xfinity and Truck series, the two lower-level national series in NASCAR. That's because they've adopted the Chase playoff format similar to the Cup series. Like Cup, both series have just one race remaining _ this weekend at Phoenix International Raceway _ before the four-driver championship round on Nov. 18 (Trucks) and Nov. 19 (Xfinity) at Homestead-Miami Speedway.
Here's how the title races shape up in those two divisions:
