Bantamweight and featherweight boxer who has held the WBA super featherweight, WBC super bantamweight, and IBF bantamweight titles. In February 2017, he was ranked as the world's 7th best pound-for-pound fighter in the world by BoxRec.
His amateur boxing career concluded in 2010 with a record of 148 wins and 7 losses.
In February 2017, he was ranked as the world's top featherweight fighter by The Ring magazine, BoxRec, and the Transnational Boxing Rankings Board (TBRB.) He won his first 33 fights before a loss in his 34th to Carl Frampton.
He was born and raised in Huetamo, Michoacán, Mexico.
He won the WBA super featherweight title in August 2015 after defeating Abner Mares.