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Katie Ledecky broke her longstanding world record in the 800m freestyle and Gretchen Walsh lowered her 100m butterfly world mark twice in one day as the Tyr Pro Swim meeting in Fort Lauderdale, Florida concluded on Saturday.

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US freestyle great Katie Ledecky posted the second-fastest 400m free time of her storied career on Thursday, clocking 3min 56.81sec to run down Summer McIntosh for a second stunning victory in as many days at the TYR Pro Swim Series meeting in Florida.