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Guillermo Javier Saputo (born May 1, 1977 in José C. Paz Partido, Buenos Aires) is a light middleweight boxer from Argentina, who represented his native country at two consecutive Summer Olympics, starting in 1996 in Atlanta, Georgia. He also represented Argentina at the 1995 Pan American Games and 1999 Pan American Games. Nicknamed "El Tano" and/or "El Caballero" he made his professional debut in 2001.