Phelps Wins 18th Olympic Gold as U.S. Takes 400-Meter Medley

Michael Phelps won a record-extending 18th gold medal in the final race of the most successful career in Olympic history.

The 27-year-old American helped the U.S. team, which included Matthew Grevers, Brendan Hansen and Nathan Adrian, take the 400-meter medley relay at London’s Aquatic Centre.

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