Katie Ledecky

Kathleen Genevieve Ledecky (born March 17, 1997) is an American swimmer who specializes in freestyle events and is an Olympic gold medalist. In her Olympic debut at the 2012 Summer Olympics as a 15-year old, Ledecky won the gold in the 800-meter freestyle with the second-fastest swim of all time. She is the current American record holder in the 800-meter freestyle.