The youngest heavyweight champion in boxing history; the undisputed world champion from 1987 to 1990; the first heavyweight boxer to simultaneously hold the WBA, WBC, and IBF titles; and the only heavyweight to successively unify them.

Iron Mike

50-6 (44 KOs)

Boxing’s pound-for-pound king; the first former middleweight champion to win a heavyweight title in 106 years; silver medalist at the 1988 Olympics; held multiple world championships in four different weight classes; and the Boxing Writers Association of America’s “Fighter of the Decade” for the 1990s

Superman

66-9 (47 KOs)

Social icon, music artist, undefeated boxer and KSI’s father

The Problem Child

1-0 (1 KO)

The NBA’s first three-time Slam Dunk Contest champion; 10-year NBA veteran, and collegiate football standout

Kryptonate

0-0

Former world champion in two weight classes; held the WBC super-middleweight title from 2015 to 2017 and the WBA light-heavyweight title in 2017

The Ripper

22-3-3 (13 KOs)

U.S. Army veteran; spent three-and-a-half years as a machine gunner in the infantry, including one year in Iraq

The Beast

13-0 (6 KOs)

Reigning WBC World Youth Lightweight Champion

The Technician

13-0, 7 KOs

13-2-1, 4 KO

Reigning WBC World Youth Featherweight Champion

14-2, 11 KOs

Undefeated prospect and highly-decorated amateur featherweight

Kid

8-0, 1 KO

Former WBC title-challenger

The Italian Nightmare

18-3, 16 KOs

15-3, 9 KO