Phelps wins 18th gold medal in final race of his career
London Olympics Swimming
United States' Michael Phelps watches teammate Nathan Adrian swim in the men's 4 X 100-meter medley relay as he gets out of the water at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics, London, Saturday, Aug. 4, 2012. (AP Photo/Jae C. Hong)






