Carl Frampton is a Northern Irish former professional boxer who competed from 2009 to 2021. He held world championships in two weight classes, including the WBA (Unified) and IBF super-bantamweight titles between 2014 and 2016, and the WBA (Super) featherweight title from 2016 to 2017. He also held the WBO interim featherweight title in 2018. At regional level, he held the European and Commonwealth super-bantamweight titles between 2011 and 2014.

Santos Saúl Álvarez Barragán, commonly known as Canelo, is a Mexican professional boxer. He has held multiple world championships in four weight classes from light middleweight to light heavyweight, including unified titles in three of those weight classes and lineal titles in two. Álvarez is the first and only boxer in history to become undisputed champion at super middleweight, having held the World Boxing Association (WBA), World Boxing Council (WBC) and Ring magazine titles since 2020, and the International Boxing Federation (IBF) and World Boxing Organization (WBO) titles since 2021.