Katie Ledecky

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Katie Ledecky smiles at her teammates after competing in the final round of the women's 1650 yard freestyle race en route to a new American record with a time of 15:15.17 at the swimming Winter National Championships Saturday, Dec. 7, 2013, in Knoxville, Tenn. Ledecky broke the old record of 15:24.35 set by Katie Hoff in 2008. (AP Photo/Wade Payne)