Catch Michael Phelps wins 21st Olympic gold medal. Michael Phelps wins 21st Olympic gold medal as U.S. dominates 4x200-meter freestyle relay.
— Finish Line (@FinishLine) August 10, 2016
Watch Michael Phelps wins 21st Olympic gold medal at Rio
michael phelps olympic 2016 rio olympics Sports swimmingCatch Michael Phelps wins 21st Olympic gold medal. Michael Phelps wins 21st Olympic gold medal as U.S. dominates 4x200-meter freestyle relay.