• Reuters

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American teenager Katie Ledecky set a world record in the 400-meter freestyle at the U.S. National Championships on Saturday, while Michael Phelps struggled home in sixth in the 100 backstroke.

The 17-year-old Ledecky clocked 3 minutes, 58.86 seconds to better the previous record of 3:59.15 held by Italy’s Federica Pellegrini. The Italian’s mark was set in 2009 before high-tech polyurethane swimsuits were banned.

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