French swimmer Léon Marchand beat Michael Phelps' long-standing 15-year record at the Fukuoka 2023 World Aquatics Championships on Sunday.
The 21-year-old won in the men's 400m individual medley (IM) with a record of 4:02.50, shattering Phelps' last-standing individual world record at the 2008 Beijing Olympics by a whopping 1.34 seconds. American swimmer Carson Foster came in second, clocking 4.06 seconds behind Marchand.
"That was insane, one of the most painful things I've done. It was amazing to do it here and the time is crazy," said Marchand, per the Olympics, "the best is yet to come." Marchand was presented with the gold medal by Phelps at the victory ceremony.
Here's what you should know about the new world record holder.