Pacheco turned pro in 1993 and won the vacant IBF flyweight title with a TKO of Luis Cox Coronado in Barranquilla in April 1999. Over a five-year period, Pacheco successfully defended the belt against boxers such as Masibulele Makepula, Mike Trejo, and Alejandro Félix Montiel, before losing it by TKO in a December 2004 fight against Vic Darchinyan.
