Pacheco turned pro in 1993 and won the Vacant IBF Flyweight Title with a TKO of Luis Cox Coronado in 1999. During five years, "Mambaco" Pacheco successfully defended the belt against boxers such as Masibulele Makepula, Mike Trejo, and Alejandro Félix Montiel, before losing it to a controversial fight against Vic Darchinyan, by TKO in 2004.
He moved up in weight and took on Jhonny Gonzalez in March 2007, but lost via TKO, possibly signaling the end of his career.
|IBF Flyweight Champion
10 Apr 1999– 16 Dec 2004