By Onochie Anibeze reporting from London
Michael Phelps ended his career with another gold as the United States won the medley relay at the London Olympics on Saturday.
Phelps leaves the sport with a record 18 golds and 22 medals overall. At this Games he won four golds and two silvers.
In the final swimming event of the eight-day meet, the Americans clocked 3 minutes, 29.35 seconds.
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