Ray Charles Leonard, best known as Sugar Ray Leonard, is an American former professional boxer, motivational speaker, and occasional actor. Often regarded as one of the greatest boxers of all time, he competed professionally between 1977 and 1997, winning world titles in five weight classes; the lineal championship in three weight classes; as well as the undisputed welterweight championship. Leonard was part of the "Four Kings", a group of boxers who all fought each other throughout the 1980s, consisting of Leonard, Roberto Durán, Thomas Hearns, and Marvin Hagler. Leonard also won a light welterweight gold medal at the 1976 Summer Olympics.

Roberto Durán Samaniego is a Panamanian former professional boxer who competed from 1968 to 2001. He held world championships in four weight classes: Lightweight, welterweight, light middleweight and middleweight. Duran also reigned as the undisputed and lineal lightweight champion and the lineal welterweight champion. He is also the second boxer to have competed over a span of five decades, the first being Jack Johnson. Durán was known as a versatile, technical brawler and pressure fighter, which earned him the nickname "Manos de Piedra" for his formidable punching power and excellent defense.