United States' Katie Ledecky competes in a women's 800-meter freestyle swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. (AP Photo/Michael Sohn)
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United States' Katie Ledecky competes in a women's 800-meter freestyle swimming heat at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London, Thursday, Aug. 2, 2012. (AP Photo/Michael Sohn)
