Michael Phelps won his first Olympic gold medal 16 years ago at Athens 2004. Enjoy the very first of 28 Olympic medal races. USA Swimming Team USA | Olympics

With a total of 28 medals (23 Gold, 3 Silver, 2 Bronze) US swimmer Michael Phelps is most successful Olympian of all time. Here's a look at him in action at London 2012. 🏅🏊‍♂️🇺🇸 For the full Olympic schedule visit https://oly.ch/37AZTV3 | Olympics

Again, Michael Phelps, congratulations! 21st Gold! | Olympics

Take a look back at the legendary career of Michael Phelps, "the greatest Olympic champion of all time." | Team USA

On the last #FlashbackFriday of the year, the Olympic Channel takes you back to Michael Phelps' record breaking performance in Beijing! | Team USA

From his first to his last, no one did it like Michael Phelps. 19 years ago today, the 🐐 made his first Olympic final at 15 years old. | Team USA

This 10-year old just broke a record that Michael Phelps held for 23 years. His name is Clark Kent Apuada. And of course, they call him "Superman." The swimming phenom won the 100-meter butterfly in 1:09:38 — beating Phelps' record at the same championship in 1995 by more than second | CNN