Tempers simmering as Cup Series action moves to Martinsville

(Photo credit: Gary A. Vasquez-USA TODAY Sports)
When NASCAR's most unflappable and respected driver becomes slightly unhinged at the end of a race, you know the action is heating up on the short-track portion of the Cup Series schedule.

After stops in Phoenix, Bristol and Richmond, the first half of the regular season's collection of short-track points races comes to an end when the Cup Series visits historic Martinsvil