Katie Ledecky of the United States swam to her second gold of the Games in the women’s 800 meters, a victory made all the more satisfying because it was at the expense of her rival Ariarne Titmus of Australia. Caeleb Dressel of the United States won his third gold medal, setting a world record in the 100-meter butterfly.
But there was disappointment for the U.S. swimmers in the new mixed medley relay: Ryan Murphy had the team in the lead after the opening backstroke leg, but they faded on the breaststroke and butterfly, all the way to last place at one point.