It's no longer the biggest story in the NASCAR world, after controversial late-race tactics by Michael Waltrip Racing earned them significant penalties, but the downfall of Brad Keselowski still merits some conversation as the Chase for the Sprint Cup begins in Chicago this weekend.
Namely, the following question needs an answer: why is Keselowski only the second defending Chase champion (the other being Tony Stewart in 2006) to miss the following year's 10-race playoff?
The answer isn't as simple as you might think.
Yes, of course Keselowski's engine failure two weeks ago in Atlanta may have been the final straw. After leading 31 laps and running up front for most of the race, he lost an engine, taking him out of a sure-fire top-10 ru...
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