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Biggest Underdogs of 2012

10 of 20

Juan Marquez

Manny Pacquiao had already defeated Juan Marquez in two previous bouts. The other ended in a draw. In their fourth matchup, Marquez delivered a sixth-round blow to Pacquiao that resulted in arguably the best knockout punch of the year.(AP Photo/Eric Jamison)

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

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