Five-time Olympic gold medalist Katie Ledecky broke her own American and NCAA records in the women’s 500-yard freestyle Thursday night at the Pac-12 championships in Federal Way, Washington, dominating the rest of the field in 4 minutes, 25.15 seconds.
A freshman at Stanford, Ledecky, 19, finished more than 10 seconds ahead Casinoslot of the runner-up, Cardinal teammate Katie Drabot.
Ledecky cut more than a second off her previous record of 4:26.46, which she set in November at the Ohio State Invitational.
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