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Ledecky raced her way to a 3:58.86 to win the middle distance event, and down Federica Pellegrini’s world record (3:59.15) and her own American record (3:59.82) as she blasted through the 3:59 barrier.
Ledecky, who already holds the world records in the 800 (8:11.00) and 1500 (15:34.23) freestyle events, becomes the first swimmer to hold all three records at the same time since Janet Evans did so in 1987.
See the result list here.