Editor's note: NBC broadcasters will offer opinions on upcoming races the remainder of the season. This week, analyst Kyle Petty discusses Sunday's Citizen Soldier 400 at Dover International Speedway, starting about 2:15 p.m. on NBCSN.
In many ways, it's the Chase within the Chase for the Sprint Cup.
Drivers who celebrated making the 16-driver, championship-determining field less than three weeks ago are now on the bubble when it comes to advancing again. Dover is the last chance for four of them.
MORE: 16 for '16: Chase drivers | Dover schedule
The mission for most of the field this weekend?