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Biggest Underdogs of 2012

7 of 20

U.S. Teen Makes Olympic History

Katie Ledecky didn't perform like the youngest member of the U.S. swim team when the 15-year-old earned gold in the women's 800m freestyle final. Ledecky's time of eight minutes, 14.63 seconds was a half-second shy of the world record. (AP Photo/Lee Jin-man)

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

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