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Biggest Underdogs of 2012

18 of 20

Adrian Peterson

It's not often that a running back has a Pro Bowl season just one year removed from ACL and MCL tears. Then again, Adrian Peterson isn’t most running backs. With one game to play, the Vikings' workhorse is just shy of breaking Eric Dickerson’s single-season rushing record of 2,105 yards. (AP Photo/Seth Perlman)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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