According to the Associated Press, Harry challenged Ryan Lochte during the American swimming champion's 28th birthday party at the XS nightclub pool at the Wynn resort.
Las Vegas Sun columnist Robin Leach reports the prince stripped down to his jeans and had the pool cleared out before the two launched into an all-out swimming sprint.
To nobody's surprise, the 11-time Olympic medalist beat out the brother of recently married Prince William.
The video of the race follows recently leaked photos that show Prince Harry completely nude during a reported game of strip billiards that same weekend. The photos were apparently taken in a room full of friends in his VIP suite on Friday night during a raging party.
According to TMZ, Harry was with a large entourage before he went down to the hotel bar and met a group of female companions. The girls were reportedly invited back to the suite where they snapped photos of the madness. In one photo, a fully nude Harry covers his private parts while a seemingly topless woman stands behind him.
In another photo, a naked Harry is bear-hugging a woman who appears to be completely naked as well.
Multiple news outlets are reporting that The Royal Family is furious over the Prince Harry leaked naked photos.
Check below for the video of Prince Harry versus Ryan Lochte in a swimming race.
Prince Harry Versus Ryan Lochte Video