The NASCAR Xfinity Series will set the Championship 4 field, and the NASCAR Cup Series will set the Round of 8 finale's starting lineup Saturday at Martinsville Speedway.
Cup teams will practice and qualifying Saturday afternoon at the 0.526-mile oval, where Ryan Blaney is the defending winner. Blaney is one of six playoff drivers vying for two remaining spots in the Nov. 10 title race at Phoenix Raceway.
The Xfinity Series' Round of 8 finale will be at 4 p.m. ET. Two spots are remaining in the Championship 4 field with winners A.J. Allmendinger (Las Vegas Motor Speedway) and Austin Hill (Homestead-Miami Speedway) having advanced to the title race Nov. 9.
Saturday: Mostly cloudy skies with a high of 66 degrees and a 0% chance of rain at the start of Cup qualifying. Mostly cloudy skies with a high of 68 degrees and a 0% chance of rain at the start of the Xfinity race.