Katie Ledecky qualifies for fourth Olympics; Gretchen Walsh sets world mark in 100 butterfly
INDIANAPOLIS — Swimmer Katie Ledecky, a seven-time gold medalist, is headed to her fourth Olympics, winning the women’s 400-meter freestyle at the U.S. swimming trials on Saturday to qualify for next month’s Paris Games. Earlier in the evening, Gretchen Walsh set a world record in the 100-meter butterfly.