Muhammad Ali is considered one of the greatest athletes in boxing history, winning both the coveted Golden Gloves title and an Olympic gold medal, among several other honors.
George Foreman is a retired American boxer who twice won boxing's heavyweight championship. After retiring, he became a popular pitchman.
Joe Frazier was the world heavyweight boxing champion from February 1970 until January 1973 and fought in the famous "Thrilla in Manila" in 1975.
Boxer Evander Holyfield fought in the Olympics and reigned as the world heavyweight champion from 1990 to 1992, and again from 1993 to 1994. In an infamous bout in 1996, Holyfield's ear was bitten by Mike Tyson.
Sugar Ray Leonard was a champion Olympic and professional welterweight boxer. He retired from the sport in 1997 and was inducted into the Boxing Hall of Fame.
American boxer Floyd Mayweather is one of the best pound-for-pound fighters of his generation. HBO's documentary about him, 24/7, increased his popularity.
American boxer Floyd Patterson was the first to hold the world heavyweight championship twice. He won a gold medal in the 1952 Olympic Games.
Claressa Shields is an American boxer who made her Olympic debut at the Summer Games in London in 2012, and took home an Olympic middleweight gold medal.
Teófilo Stevenson was a Cuban boxer best known for becoming the first fighter to win three Olympic gold medals in one weight class.