CNN —US swimming star Katie Ledecky qualified for her fourth Olympic Games by winning the 400m freestyle on Saturday at the US Swimming Olympic Team Trials. Sarah Stier/Getty Images100m butterfly world record in the semifinalsElsewhere, Gretchen Walsh set a world record in the women’s 100m butterfly with a time of 55.18 in a semifinal heat. The 21-year-old Walsh swam past the record mark of 55.48 set by Sweden’s Sarah Sjöström at the 2016 Rio de Janeiro Olympic Games. Walsh will look to qualify for her first Olympic Games on Sunday. The US Swimming Olympic Team Trials continue through June 23.

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Persons: Katie Ledecky, “, ”, Ledecky, I’ve, Gretchen Walsh, Sarah Stier, Walsh, Sweden’s Sarah Sjöström Organizations: CNN, Olympic, Lucas Oil, Reuters, Indianapolis Colts, Olympic Games Locations: Indianapolis , Indiana, London, Paris