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.
ASU's Leon Marchand sure to star in the pool at Paris Olympics
Marchand smashes Phelps's last remaining world record - SportsDesk
Marchand Breaks Phelps' Final Solo World Record
Marchand Opens FINA World Championships With Second-Fastest 400 IM Time in History
Leon Marchand surpasses Michael Phelps' 200 meter IM Pro Swim Series record
French swimmer Leon Marchand breaks Michael Phelps's 400m world record
Leon Marchand and Summer McIntosh are sure to star in the pool at Paris Olympics
Leon Marchand Shatters Two French Records 43 Minutes Apart on Night 4 in Budapest
Léon Marchand is France's new swimming star in perfect timing for Paris Olympics, Olympics
