Michael Phelps won his last race of the 2012 Olympics tonight - the 4x100-meter medley relay - giving the U.S. the lead during his 3rd leg of the race, a lead that they did not give up. With that, Phelps, who announced before the Olympics that this would be his last one, will finish his Olympic career with 22 medals (18 gold) - a record. Props to Phelps for finishing his career on top. Greatest Olympian ever?