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.

Speedo and Arena—the Coke and Pepsi of the $1 billion swimwear market—are challenged by an upstart led by Olympian Michael Phelps.

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.