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Katie Ledecky wins world championship rematch, shaves three seconds off U.S. record

Seven weeks after losing the 400m freestyle while feeling the effects of an ill-timed illness at the swimming world championships, Katie Ledecky took a measure of revenge Sunday in the debut meet of the International Swimming League, finishing in a U.S. record 3:54.06, 3.55 seconds ahead of world champion Ariarne Titmus of Australia.

The ISL, unlike the world championships and traditional international meets, uses the short-course lap distance of 25 meters. Ledecky rarely swims at that distance — her college meets were measured in yards rather than meters — and she took advantage of the rare opportunity to smash the U.