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Katie Ledecky

Ledecky delayed her college enrollment for a year to concentrate on training for the Rio Olympics. With a handful of world records and four gold medals under her belt in 2016, she started as a freshman at Stanford that fall.

Given her strong showing in Rio, Ledecky could have made $5 million annually in endorsements if she went pro, according to Olympic sports marketing expert Bob Dorfman. She decided not to go that route. At Stanford, she has Olympic medalists Simone Manuel and Lia Neal as swimming teammates.

[Photo via @kledecky]

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