Ledecky, who won the women’s 400 metres freestyle event on the opening day, cruised to the gold medal with a time of 15 minutes and 30.15 seconds.
The 25-year-old finished more than 14 seconds ahead of compatriot Katie Grimes who took the silver while Australia’s Lani Pallister took the bronze.
Katie Ledecky made history again!Her World Champs performance in the 1500m 2013👉🥇2015👉🥇2017👉🥇2022👉🥇… https://t.co/aIOcToYWQ6
— FINA (@fina1908) 1655743736000
“I love this pool, I knew I put in the work to have a good swim and got into a rhythm,” Ledecky said.
“I’ve got the relay, that’s next on the agenda and then I will tackle the 800m. We’ll see (if I can get a record).”
Earlier, Romanian teenager David Popovici smashed the world junior record as he powered to victory to take gold in the men’s 200 metres freestyle event.
The 17-year-old became the first male Romanian swimmer to win gold at the world championships as he finished with a time of 1:43.21.
He finished more than a second ahead of South Korea’s Hwang Sun-woo while Britain’s reigning Olympic champion Tom Dean finished third.