Nobody saw Jimmie Johnson's engine failure coming with six laps to go in Sunday's Pure Michigan 400 at Michigan International Speedway. Instead of extending his points lead over Greg Biffle, Johnson fell to fourth in the standings at a time when many thought him invincible. Biffle inherited the victory and the points lead.
In other words, what you think you know about the rest of this Sprint Cup season might be all wrong.
There's plenty of unpredictability left in the final 13 races on the schedule, from the three events before the Chase to the 10 events that make it up. Today, we'll be checking off the five tracks that offer the greatest chances for surprise finishes, along with an example of an exciting race from the Chase era (2004-present).