Sergio Gabriel Martínez is an Argentine professional boxer. He has held world championships in two weight classes, including the WBC super welterweight title from 2009 to 2010; and the unified WBC, WBO, Ring magazine and lineal middleweight titles between 2010 and 2014. With six successful defenses of The Ring and lineal middleweight titles, Martínez's 50-month reign as champion ranks as one of the longest in the history of that weight class.

Floyd Joy Mayweather Jr. is an American boxing promoter and former professional boxer who competed between 1996 and 2017. He retired with an undefeated record and won 15 major world championships from super featherweight to light middleweight. This includes the Ring magazine title in three weight classes and the lineal championship in four weight classes. As an amateur, he won a bronze medal in the featherweight division at the 1996 Olympics, three U.S. Golden Gloves championships, and the U.S. national championship at featherweight.