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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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Olympic 200m champion Gabby Thomas was among the first big winners of the inaugural Grand Slam Track series on Saturday, digging deep to finish second in the women's 400m to clinch the  $100,000 long sprints jackpot.