Ledecky, 28, improved on the previous record of 8:04.79 that she set at the Rio de Janeiro Olympics on August 12, 2016.
It was Ledecky's first world record in a long-course 50m pool since 2018.
US swim star Katie Ledecky shatters her own 800m freestyle world record
Nine-time Olympic gold medallist Katie Ledecky shattered her near nine-year-old record in the 800m freestyle on Saturday, clocking 8min 04.12 to win at the Tyr Pro Swim Series meeting in Fort Lauderdale, Florida.
