Australia's Ariarne Titmus set the women's 400-meter freestyle world record at the world aquatics championships Sunday in Japan.

Titmus won in 3 minutes, 55.38 seconds at Marine Messe Fukuoka, finishing 3.35 seconds ahead of American runner-up Katie Ledecky.

Erika Fairweather of New Zealand was third in 3:59.59, while 16-year-old Canadian star Summer McIntosh settled for fourth in 3:59.94.

Australia's Ariarne Titmus competes en route to winning the women's 400-meter freestyle final with a world record time on July 23, 2023, at the world aquatics championships at Marine Messe Fukuoka in Fukuoka, Japan. (Kyodo)

Titmus, who achieved a 200-400 freestyle double at the Tokyo Olympics in 2021, took the lead early in the race and held on for the gold medal as she eclipsed McIntosh's previous world mark of 3:56.08, set in March.

France's Leon Marchand also set a world record, winning the men's 400-meter individual medley in 4:02.50. Carson Foster of the United States finished 4.06 seconds behind for silver, and Japan's Daiya Seto took bronze in 4:09.41.