Michael Phelps

"If you're not ready for the big time, we've got thousands of young gymnasts that would love to take your place," the conservative activist said of Biles, the most decorated U.S. gymnast of all time.

The former first lady took to Twitter to back the 24-year-old gymnast with an inspiring message.

"We're human beings, nobody is perfect. It's ok to not be ok. It's ok to go through ups and downs and emotional roller coasters," said Phelps, the most-decorated Olympian of all time.

"I feel uncomfortable being the spokesperson or face of athlete mental health as it's still so new to me and I don't have all the answers," said the tennis star.

The 21-year-old sprinter could be shut out of the Tokyo Olympics, which start in three weeks. Fans have been calling for her to get "the same pass Michael Phelps received."

The only way that the "old" Ryan Lochte can make a fifth Olympic team is to become the old Ryan Lochte on Friday night at the Olympic swimming trials.

Keller's teammates on the 2004 freestyle relay included Michael Phelps and Ryan Lochte. Keller was wearing a Team USA jacket in this video.

On Monday in Hungary, the 24-year-old from Florida did something no other swimmer in history has done. Not Ryan Lochte or even the great Michael Phelps.

The 2020 Tokyo Summer Games would have started today. However, here are 10 of the top American performances in Summer Olympic history, from Jesse Owens to Muhammad Ali and Michael Phelps.

Phelps had held the world record in his signature event since 2009, but Milak took .78 seconds off it on Wednesday.

It's going down on July 23.

Ranking the top five summer Olympians of all time compels you to omit some extremely worthy athletes.

From the pool to the track to the beach and beyond, the Olympics had a gold-medal weekend in Rio.

Michael Phelps finishes his career with 23 gold medals and 28 overall, 10 higher than the next most successful Olympic athlete.

The decorated Olympian says, 'I've been able to do everything I've ever put my mind to in this sport...I'm happy with how things finished.'

Michael Phelps claimed golds number 20 and 21 in the pool and the U.S. dominated in gymnastics.

Research suggests cupping may be helpful, but many seem reactively against it.

Swimmer's website targeted by same hacking collective that took down Donald Trump's website.

The speedy Olympian Michael Phelps, 29, was clocked traveling 84 miles per hour in a 45-mph zone.

18-time Olympic gold medalist takes to Twitter to say sorry for second DUI.