Ward followed up on his Olympic success by winning the WBA super middleweight championship in 2009.
2 of 13John Iacono/SI
Oscar De La Hoya
After fulfilling his mother's dying wish by winning a gold medal, "The Golden Boy" captured titles in six different weight classes.
3 of 13AP
As the youngest member of a U.S. Olympic boxing team that captured 11 medals -- nine gold, one silver and one bronze -- the 17-year-old Taylor went on to a pro career that included titles at light welterweight and welterweight.
4 of 13Peter Read Miller/SI
After capturing gold in L.A., "Sweet Pea" went on to win titles in four different weight divisions.
5 of 13Neil Leifer/SI
Sugar Ray Leonard
The Palmer Park, Md., native built his brand in Montreal, headlining an Olympic team that won five medals. He'd later win titles in five separate weight classes as a professional.
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After winning gold in Montreal, Spinks won the world heavyweight championship against Muhammad Ali in just his eighth professional fight -- the fastest ascent in history.
7 of 13Neil Leifer/SI
After winning Olympic gold alongside his older brother, Michael won titles at light heavyweight and heavyweight.
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Foreman enjoyed two stints as world heavyweight champion -- in the 1970s and, improbably, in the '90s -- after winning the gold medal in Mexico City.
9 of 13UPI Cablephoto
After making the Olympic team as a replacement for Buster Mathis, Frazier won the gold medal despite suffering a broken thumb in his semifinal bout (and not telling anyone). He'd later ascend to the heavyweight championship as a professional.
10 of 13AP
Clay capped off a decorated amateur career with the Olympic championship. As a pro, the Louisville native became the first and only three-time lineal heavyweight champion.
11 of 13Corbis Images
After winning Olympic gold in Finald, Patterson became the youngest heavyweight champion in history (a record later felled by Mike Tyson) -- and the first to regain his title after losing it.
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Fields won Olympic gold as a featherweight in 1924, capturing the world welterweight title as a pro.
13 of 13Corbis Images
One of the all-time great flyweights, Genaro followed up his Olympic title by winning the 112-pound world championship as a professional.
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