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Ivan 'Iron Boy' Calderon retires

Updated: October 29, 2012, 8:21 PM ET
By Dan Rafael | ESPN.com

Ivan "Iron Boy" Calderon, who won world titles in two weight classes and went years without being seriously challenged as one of the best pure boxers of his generation, announced his retirement on Monday.

Calderon, 37, made his announcement three weeks after strawweight titlist Moises Fuentes knocked him out in the fifth round in a challenge for the title he once held.

Calderon, a 2000 Puerto Rican Olympian, made the announcement at the Amelia Municipal Boxing Gym in his hometown ...

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