In the last day of London's swimming competition, the American women won the 4x100-meter medleyrelayrace, setting a new world record with a time of 3:52.05.
But history on Saturday also favored the leaders, as the most decorated Olympian of all time tallied another win with his American teammates in the 4 x 100-meter medleyrelay, handing Michael Phelps his 18th gold medal in the last race of his storied swimming career.