Nicknamed "El Relámpago", Chacon won a Featherweight Bronze medal at the 1996 Summer Olympics.

On this occasion Chacon defeated Istvan Kovacs by TKO to win the WBO Featherweight title.

[1] Chacon would eventually lose the title in 2002 to interim champ Scott Harrison via unanimous decision.

[2] He later moved up a weight class and challenged American cotender Mike Anchondo for the Vacant WBO Super Featherweight Title, Chacon lost via unanimous decision.

In 2010 he won the Konex Award Merit Diploma as one of the five best boxers of the last decade in Argentina.