In winning his 23rd gold medal, completing the third section of a four-section race with Ryan Murphy, Cody Miller, and Nathan Adrian, Phelps becomes a legend for the ages. His incredible 13 individual wins breaks a 2,000-year-old record by Leonidas. When you're breaking records set by the Greeks, what else is there left to prove?
On the other hand, teammate Ryan Lochte seems confident Phelps will swim at the Tokyo Olympics in 2020.
Whatever the outcome, Phelps' performance has been the highlight of an already exciting Olympics!
On Monday, Phelps told "Today's" Matt Lauer about retiring, "Done, done, done — and this time I mean it. I wanted to come back and finish my career how I wanted and this was the cherry on top of the cake."
He added, "I'm done. I'm finished. I'm retired. I'm done. No more."