Phelps secured a record 19th Olympic medal when the U.S. team won gold in the event Tuesday .
U.S. swimmer Michael Phelps competes in the men 's 4x200 - meter freestyle relay final .
swimmer secured a record 19th Olympic medal when the U.S. team won gold in the event Tuesday .
U.S. swimmer Michael Phelps competes in the men 's 4x200 - meter freestyle relay final .