Ledecky sets world record in women's 400 meters freestyle — reuters.com

(Reuters) - Katie Ledecky set a world record in the women's 400 meters freestyle at the U.S. National Championships in Irvine, California on Saturday. Ledecky clocked 3 minutes, 58.86 seconds to better the old mark held by Italian Federica Pellegrini at 3:59.15. (Reporting By Andrew Both in Cary, North Carolina; Editing by Peter Rutherford)

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