French and Australian swimmers shatter world records on historic first day at World Championships
- Leon Marchand of France broke Michael Phelps' 400m individual medley world record, clocking 4:02.50.
- Ariarne Titmus of Australia set a new world record in the women's 400m freestyle with a time of 3:55.38.
- Katie Ledecky took silver behind Titmus, while Erika Fairweather claimed bronze in the 400m freestyle.
- Marchand is coached by Phelps' former mentor Bob Bowman and emerged as a star for the 2024 Paris Olympics.
- Titmus solidified her dominance over Ledecky, beating her American rival for the third straight time.



























