Swim showdown: US star Ledecky, Aussie to battle for gold


              Katie Ledecky of the United States leaves the pool following heat during the women's 400-meter freestyle at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Martin Meissner)
            
              Katie Ledecky, of the United States, reacts following her heat of the women's 400-meter freestyle at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)
            
              Katie Ledecky, of the United States, swims in a heat during the women's 400-meter freestyle at the 2020 Summer Olympics, Sunday, July 25, 2021, in Tokyo, Japan. (AP Photo/Matthias Schrader)