Pacheco began boxing at the age of ten and amassed over seventy-five bouts and eight National championships in his amateur career.
[4] He made his professional debut on December 22, 2018, at the Auditorio Fausto Gutiérrez Moreno in Tijuana, Mexico, against Luis Carlos Gonzalez, winning by knockout (KO) early in the first round.
[6] On December 7, 2019, he featured on the undercard of Andy Ruiz Jr. vs Anthony Joshua II in Riyadh, Saudi Arabia, knocking out the more experienced opponent Selemani Saidi with a right hand.
[7][8] On February 29, 2020, Pacheco defeated Oscar Riojas via six-round unanimous decision (UD) on the undercard of Mikey Garcia vs. Jessie Vargas at the Ford Center at The Star in Frisco, Texas.
[12] He won the fight by unanimous decision and retained his WBC USA and WBO International super middleweight titles.