The most decorated Olympian of all time - he would later add his 21st gold with victory in the relay - was neck and neck with Le Clos for the first 100m but then pulled away in the second half of the race leaving a desperate Le Clos, in the next lane, battling to keep up.
South African Le Clos, with each lunge of his body seeming more desperate than the last, was looking to his left at his great rival, hoping to reel him in. In fact, it was the Japanese swimmer Masato Sakai who almost caught Phelps, the American winning in 1min 53.36sec just four hundredths of a second ahead of second spot.
The One Tree Hill alum and the 32-year-old — who are already parents of a 17-month-old baby boy — met while filming the movie Chosen and secretly tied the knot in January 2015.
Related: Hilary Duff Once Lusted After THIS Charming Costar! but you'd never be able to tell based on how tight the cast still is to this day. Well, maybe a classic three-piece is a bit formal for a country show, but hey, he was working that John Varvatos suit!
The Hungarian Tamas Kenderesi shot into third leaving Le Clos empty-handed.