Marco Antonio Barrera is a retired Mexican professional boxer. He has won numerous world titles in three different weight classes.As an amateur, Barrera had a record of 104–4 and was a five-time Mexican national champion. Before losing his first amateur contest, Barrera had an undefeated record of 56–0.Barrera made his professional debut at 15 when he defeated Leonilo Embuestro Jr. of Philippines by a knockout in round two on November 22, 1989. The victory marked the beginning of a 43 fight win streak.