FUKUOKA, Japan—French youngster Leon Marchand produced a dazzling performance to shatter American great Michael Phelps’ long-standing 400 meters individual medley record on the opening day of swimming events at the World Aquatics Championships on Sunday.
Phelps’s mark of 4:03.84 set at the 2008 Beijing Olympics was his last remaining individual world record but it fell to the 21-year-old Marchand who started superbly and clocked 4:02.50 to beat Carson Foster who took silver.