With the NASCAR Sprint Cup Series field having passed through Watkins Glen, the wild card tracks are more or less off the schedule.  The opportunity for an underdog to sneak a Chase berth has passed.  There are four races left before the Chase and if anyone not currently in contention is going to make the postseason, it will need to come via a strong performance in a fast car, not the luck of a restrictor plate track and not the tactility of a road course.

That holds especially true this weekend at Michigan International Speedway, as the two-mile oval is one of the fastest tracks on the schedule.  Here's a look at three drivers to keep an eye on in this race:

Green Flag - Kevin Harvick

He dominated at this track in June, starting second and leading 63 laps, but pit road trouble immediately before a race-ending red flag for rain cost him dearly.  That finish broke up an impressive streak of four consecutive second-place finishes at Michigan.

Yellow Flag - Kurt Busch

The June winner led only the final six laps in a rain-shortened event, but that was enough for the win. It was his third victory at Michigan, but he also has a mind-boggling eight DNFs in 29 starts at the track. Which Kurt Busch will show up on Sunday?

Red Flag - Greg Biffle

The active wins leader at Michigan has just three top-10s in 22 starts this season.  If he's going to sneak an unexpected Chase berth, it will be with a victory this weekend, but that seems unrealistic.