foxsports
Michael Phelps heads into retirement the only way imaginable - with an 18th Olympic gold medal.
Since his Olympic debut as a 15-year-old in Sydney a dozen years ago, Phelps has won twice as many golds as any other Olympian. His total of 22 medals is easily the best mark, too.
Phelps capped off a mind-boggling career with a victory in the 4x100-meter medley relay Saturday.
Here's a look back at Phelps' Olympic career in photos:
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