Muhammad Ali (born Cassius Marcellus Clay Jr.; January 17, 1942) is a retired American boxer and three-time World Heavyweight Champion, who is widely considered one of the greatest heavyweight championship boxers of all time. As an amateur, he won a gold medal in the light heavyweight division at the 1960 Summer Olympics in Rome. After turning professional, he went on to become the first boxer to win the lineal heavyweight championship three times.

Julio César Chávez González (born July 12, 1962 in Ciudad Obregón, Sonora) is a former Mexican professional boxer. He is a six-time world champion in three weight divisions. His career spanned over twenty-five years. In his prime he was considered the best pound-for-pound boxer in the world. He ranks #24 on ESPN's 50 Greatest Boxers Of All Time.

Sugar Ray Robinson (born Walker Smith Jr., May 3, 1921 – April 12, 1989) was a professional boxer. Frequently cited as the greatest boxer of all time, Robinson's performances at the welterweight and middleweight divisions prompted sportswriters to create "pound for pound" rankings, where they compared fighters regardless of weight. He was inducted into the International Boxing Hall of Fame in 1990.

Joseph Louis Barrow (May 13, 1914 – April 12, 1981), better known as Joe Louis, was the world heavyweight boxing champion from 1937 to 1949. Nicknamed the Brown Bomber, Louis helped elevate boxing from a nadir in popularity in the post-Jack Dempsey era by establishing a reputation as an honest, hardworking fighter at a time when the sport was dominated by gambling interests. Louis's championship reign lasted 140 consecutive months, during which he participated in 27 championship fights, including 25 successful title defenses – all records for the heavyweight division. In 2005, Louis was named the greatest heavyweight of all time by the International Boxing Research Organization, and was ranked number one on Ring Magazine's list of 100 Greatest Punchers of All Time.

Roy Jones, Jr. (born January 16, 1969 in Pensacola, Florida) is an American boxer and current NABO and IBC light heavyweight champion. As a professional he has captured IBF championships in the middleweight, super middleweight and light heavyweight divisions and is commonly regarded as one of the greatest boxers of all time.

He also won the WBA heavyweight title in his only fight in this weight class. Jones was named "Fighter of the Decade" for the 1990s by the Boxing Writers Association of America

Archie Moore, born Archibald Wright (December 13, 1913 – December 9, 1998), was light heavyweight world boxing champion between 1952 and 1959 (and again in 1961) and had one of the longest professional careers in the history of his sport. A native of Benoit, Mississippi, raised in St. Louis, Mo., he died four days short of his 85th birthday, in his adopted home of San Diego, California. He was an important community figure, and became involved in African American causes once his days as a fighter were over. Nicknamed "The Old Mongoose", Moore still holds the record for the most career knockouts by any boxer, at 131. He also became a successful character actor in television and film. He placed #4 on Ring Magazine's list of "100 greatest punchers of all time".

Marvelous Marvin Hagler (born Marvin Nathaniel Hagler, in Newark, New Jersey, May 23, 1954), is a former Undisputed Middleweight boxing champion of the world. Hagler's record is 62-3-2 with 52 knockouts. Marvelous Marvin Hagler (born Marvin Nathaniel Hagler, in Newark, New Jersey, May 23, 1954), is a former Undisputed Middleweight boxing champion of the world. Hagler's record is 62-3-2 with 52 knockouts.

Sugar Ray Leonard (born Ray Charles Leonard on May 17, 1956) is a retired American professional boxer [1]. Named Fighter of the Decade for the 1980s by Ring magazine, he is widely considered to be one of the best boxers of all time, winning world titles at multiple weights and engaging in contests with such celebrated opponents as Wilfred Benítez, Thomas Hearns, Roberto Durán and Marvin Hagler. He was named after the singing legend Ray Charles.

George Edward Foreman (born January 10, 1949) is an American two-time former World Heavyweight Boxing Champion, Olympic gold medalist, and successful entrepreneur.

He became the oldest man ever to become heavyweight boxing champion of the world when, at age 45, he knocked out Michael Moorer, age 26, to reclaim the title he held 20 years earlier. He has been named one of the 25 greatest fighters of all time by Ring magazine. Nicknamed "Big George" he is now a successful businessman and an ordained Christian minister who has his own church.

Michael Gerard "Mike" Tyson (born June 30, 1966) is a retired American boxer. He was the undisputed heavyweight champion and remains the youngest man ever to win the WBC, WBA and IBF world heavyweight titles. He won the WBC title at just 20 years, 4 months and 22 days old, after defeating Trevor Berbick by a TKO in the second round. Throughout his career, Tyson became well-known for his ferocious and intimidating boxing style as well as his controversial behavior both inside and outside the ring.

He was the first ever heavyweight champion to hold the WBA, WBC and IBF titles simultaneously.

Lennox Claudius Lewis, CM, CBE (born September 2, 1965) is a retired boxer and former undisputed World heavyweight champion. He won gold for Canada at the 1988 Olympic Games as an amateur.

Along with Muhammad Ali, Evander Holyfield, Vitali Klitschko, Michael Moorer, Lewis is one of only five boxers in history to have won the heavyweight championship three times.

Lewis is 6 ft 5 in (196 cm) in height and has an 84-inch (213 cm) reach, much longer than average for his height. During his boxing prime, he weighed about 250 pounds (113 kg). Lewis often referred to himself as "the pugilist specialist".

Throughout his professional career, Lewis suffered only two losses, both of which he avenged in rematches. Upon retirement in 2003, he had defeated every opponent he had faced.

Rocky Marciano (September 1, 1923 – August 31, 1969), born Rocco Francis Marchegiano, was an Italian-American boxer and the heavyweight champion of the world from September 23, 1952, to April 27, 1956, when he retired as the only heavyweight champion in boxing history to retire having won every fight in his professional career. Marciano holds the record for the longest undefeated streak by a heavyweight and for being the only World Heavyweight Champion to go undefeated throughout his career. This record was challenged by Larry Holmes in 1985 when Holmes went 48-0 before losing to Michael Spinks twice. Light heavyweight Dariusz Michalczewski also challenged Marciano's record when he was 48-0, but lost to Julio César González in his 49th fight. Julio César Chávez holds the record for longest win streak with eighty-eight straight until he suffered a draw in 1993. Willie Pep, a featherweight, had a perfect 62-0 record before he was defeated. Packy McFarland was a lightweight (fighting between 1904-1915) who lost his first fight and then won his next 98, though he never won the lightweight title.

Evander Holyfield (born October 19, 1962) is a professional boxer from the United States and a multiple world champion in both the cruiserweight and heavyweight divisions, earning him the nickname "The Real Deal". Holyfield won the bronze medal in the Light Heavyweight division at the 1984 Summer Olympics after a controversial disqualification in the semifinal. He is the only boxer to win the heavyweight title four times.