Roy Jones Jr
'RJ' is a legend of the sport who won world titles in four weight classes, including heavyweight, and dominated the light heavyweight scene from 1997 to 2003.
Known for his hell-raising career inside the ring as well as partying antics outside of it, Duran - a four-division world champion - is regarded as the greatest lightweight of all time.
Boxing's first billion-dollar fighter is regarded as one of the greatest fighters of all time and in 2017, he surpassed Rocky Marciano's record to move 50-0 before retiring for a third time.
Having beat everyone on his record, and avenging both defeats on his record, Lewis is ranked as one of the best heavyweights of all-time and the last undisputed champion of the division.
Known for his grills, people forget how good "Big George" was with his fists. His famous win against Michael Moorer in 1991 saw him crowned the oldest heavyweight champion in history at 45.
Boxer, entertainer, activist and philanthropist - Ali is crowned as "The Greatest" to have laced a pair of gloves but his work outside the ring was just as incredible as his achievements in the ring.
In two heavyweight world title reigns, and a total of 11 years as champion, Klitschko got inducted into the Hall of Fame in 2020 for his dominance in the 2000s.
Holyfield remains the only fighter to have unified the cruiserweight division before moving up to become undisputed heavyweight champion.
"The Baddest Man on the Planet" reinvigorated the sport when he burst onto the scene in 1985 and to this day remains the youngest heavyweight world champion in history at 20-years-old.