Vic Darchinyan
Pacheco turned pro in 1993 and won the Vacant IBF Flyweight Title with a TKO of Luis Cox Coronado 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.