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Biggest Underdogs of 2012

9 of 20

Claressa Shields

Shields put an exclamation point on her two-year rise through the amateur boxing ranks in the London Olympics. The 17-year old defeated 33-year-old Nadezda Torlopova, becoming the first American woman to win boxing gold in the Summer Games. (AP Photo/Patrick Semansky)

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

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