US freestyle great Katie Ledecky, looking forward to the Olympic debut of the women's 1,500m free in Tokyo, clocked the fifth-fastest time ever in the event with a 15min 29.51sec at the Pro-Swim Series meeting in Des Moines, Iowa.
Ledecky, who set the world record of 15:20.48 on May 16, 2018, owns the top 10 times in the event and is the heavy favorite to take the first Olympic gold awarded at the distance for women.
"I'm really excited about it coming to the Olympics," Ledecky said.
"Obviously I want to do really well in that event this year, so at the moment I'm really trying to set myself up well for it."