The title of "World's Greatest Athlete" has traditionally been reserved for the Olympic decathlon champion. American Ashton Eaton is the best of the best after having set the world record twice and winning the 2012 Olympic gold medal—but he'll have to prove himself again in Rio de Janeiro.
The decathlon competition begins on Wednesday.
Get to know the gold-medal favorite.
Quick facts:
Nationality: USA
Birthday: Jan. 21, 1988
Birthplace: La Pine, Ore.
Hometown: Eugene, Ore.
Height: 6'1"
Weight: 185 lbs.