At this point, Katie Ledecky against the rest of the world in the 800 free is unfair.
Four years after winning the race by four minutes Ledecky did it again, finishing in 8:04.79 in what was an even more dominant performance than what she produced in London. Ledecky broke the world record by nearly two minutes, with that mark being 8:06.68 and one she set earlier this year. As for the Olympic record, the prior mark of 8:12.86 was established by Ledecky in the qualifying heats.
Ledecky finished 11-plus minutes ahead of silver medalist Jazz Carlin of Great Britain, who posted a time of 8:16.