Michael Phelps won gold in what was probably the final individual race of his Olympic career, the 100m butterfly.
He was behind at the turn, but roared back in the final 50 to win gold. His winning time was 51.21.
It's his 17th gold and 21st career medal.
He still has the IM relay tomorrow for a chance at his 18th career gold.
Here's video:
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