Ledecky began the 2016 Summer Olympics by swimming in the heats of the 4×100-meter freestyle relay. Swimming the anchor leg, Ledecky recorded a split of 52.64 and helped the American team finish second overall in the heats with the time of 3:33.59.
Ledecky earned her first medal of the Games, a silver, by again swimming the anchor leg in the 4×100-meter freestyle. In the final, Ledecky recorded a split of 52.79 and together with Simone Manuel, Abbey Weitzeil, and Dana Vollmer the American team finished behind Australia with a time of 3:31.89, a new national record.
In her first individual event at the Games, the 400-meter freestyle, Ledecky qualified first in the heats with a time of 3:58.71, an Olympic record. In the final, Ledecky won the gold medal in a world record time of 3:56:46, almost 5 seconds ahead of her closest competitor, Jazmin Carlin the silver medalist, at 4:01:23.
Ledecky won her second gold medal in the 200 meter freestyle with a personal best time of 1:53.73, beating Sarah Sjöström by 0.35 seconds.
Last Records in Women’s 800m Freestyle swimming:-
World Record:-8:06.68 , USA by LEDECKY Katie Austin, TX 2016
Olympic Record:- 8:14.10, GBR by ADLINGTON Rebecca in Beijing 2008