US Olympic Swim Results: Lilly King, Regan Smith, Ryan Murphy advance

One of Team USA's premier swimmers is making her Tokyo Olympics debut Sunday morning. Katie Ledecky will race in her first heat of the Games as part of the second day of swimming. The day features heats in six events: the women's 100m backstroke, men's 200m freestyle, women's 100m breaststroke, men's 100m backstroke, women's 400m freestyle and men's 4x100m freestyle relay.