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Jordyn Wieber of the United States performed on
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Jordyn Wieber of the United States performed on the uneven bars during women's team gymnastics preliminary competition at North Greenwich Arena during the 2012 Summer Olympic Games in London, England, Sunday, July 29, 2012. (David Eulitt/Kansas City Star/MCT)(Credit: MCT David Eulitt)

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Jordyn Wieber

Heading into the 2012 Summer Olympics in London, Jordyn Wieber, from DeWitt, Mich., is the reigning world champion and has lost only two all-around competitions since 2008, both to American teammates.