William Byron powered his way to victory in the Xfinity 500 at Martinsville Speedway, earning a spot in the NASCAR Cup Series Championship 4 field.

Kyle Larson breaks down his day at Martinsville Speedway after securing a spot in the Championship 4 race at Phoenix with Hendrick Motorsports.

See some of the best moments from a short-track showdown at Martinsville Speedway where Championship 4 is decided.

The two-time Daytona 500 champion from Charlotte, North Carolina, led a race-high 304 of 500-scheduled laps and clinched a ...