INDIANAPOLIS (AP) — Katie Ledecky easily won the 1,500-meter freestyle at the U.S. national championships on Saturday in Indianapolis, giving her at least three more chances to add to her world championship gold medal collection. The 26-year-old Ledecky posted the sixth-fastest time in history, finishing in 15 minutes, 29.64 seconds — more than 28 seconds ahead of second-place finisher Katie Grimes. Ledecky qualified for the Americans in all four events she competed in this week, but announced she would not compete in the 200 free later this month in Fukuoka, Japan. He failed to qualify for the “A” final in his fourth and final event of the week, the men’s 50 free. Kate Douglass set a new mark in the women’s 200 individual medley with a time of 2:07.09, beating out Alex Walsh (2:07.89).