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RIO DE JANEIRO, BRAZIL - AUGUST 12:  Katie Ledecky of the United States leads the field in the Women's 800m Freestyle Final on Day 7 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 12, 2016 in Rio de Janeiro, Brazil.  (Photo by Adam Pretty/Getty Images)
RIO DE JANEIRO, BRAZIL - AUGUST 12:  Katie Ledecky of the United States leads the field in the Women's 800m Freestyle Final on Day 7 of the Rio 2016 Olympic Games at the Olympic Aquatics Stadium on August 12, 2016 in Rio de Janeiro, Brazil.  (Photo by Adam Pretty/Getty Images)

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Ledecky crushes rivals, wins gold medal

19-year-old Katie Ledecky won a gold medal and set a new world record in the 800-meter freestyle event at the Rio Olympics.

Ledecky crushes rivals, wins gold medal

19-year-old Katie Ledecky won a gold medal and set a new world record in the 800-meter freestyle event at the Rio Olympics.