He beat the long-standing record by a smashing 1.34 seconds on Sunday, making him the world record holder in the long course 400m individual medley.
France's swimming phenom Leon Marchand and the race for Michael Phelps' world record
How Léon Marchand Became the Best Swimmer in the World
Who is Leon Marchand, the man who broke one of Michael Phelps' record?
Marchand can handle Paris Olympics pressure, says Bowman - SportsDesk
Marchand smashes Phelps's last remaining world record
Meet Léon Marchand, the French Swimmer Who Broke Phelps' Record
French swimmer breaks Michael Phelps' last individual record - Field Level Media - Professional sports content solutions
How Léon Marchand Became the Best Swimmer in the World
Hours After Breaking Michael Phelps' 21-Year-Old Standing World Record, Leon Marchand Continues to Dominate Worlds With Another Historic Achievement - EssentiallySports
Breaking: Michael Phelps' 21-Year Long Reign Shattered as Coach Bowman Creates Another Legend - EssentiallySports