Leon Marchand of France celebrates after wining Men 400m Medley final at the World Swimming Championships in Fukuoka, Japan, Sunday, July 23, 2023. AP
Marchand set the record on Sunday on the first day of eight in the pool at the World Aquatics Championships.
It was the last individual record that Phelps held since retiring for good after the 2016 Rio de Janeiro Olympics.
Marchand swims at Arizona State and is coached by Bob Bowman, the coach of the American team at the world championships. He is a potential hometown superstar going into next year's Paris Olympics. He will also be the favorite in the 200 IM.
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