Michael Phelps just swam in the 4x100 IM medley, his last Olympic race ever.
Phelps and the rest of the U.S. team won gold.
Matt Grevers swam backstroke, Brendan Hansen swam breaststroke, Phelps swam fly, and Nathan Adrian swam freestyle.
The U.S. fell behind during Hansen's breaststroke, but Phelps took back the lead and Adrian swam to an easy victory.
Phelps now has 22 career medals, 18 of them are gold.
Here's video of Phelps' last run:
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