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Biggest Underdogs of 2012

20 of 20

Peyton Manning

Critics were skeptical when the legendary quarterback chose to sign with the Denver Broncos as a free agent. Manning missed all of 2011 after numerous neck surgeries, but defied medical odds and has looked as good as ever in leading the Broncos to another AFC West title. (AP Photo/Ben Margot)

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

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