Joe Gans was an American professional boxer. Gans was rated the greatest lightweight boxer of all-time by boxing historian and Ring Magazine founder, Nat Fleischer. Known as the "Old Master", he became the first African-American world boxing champion of the 20th century, reigning continuously as world lightweight champion from 1902 to 1908, defending the title 15 times versus 13 boxers. He was inducted into the International Boxing Hall of Fame in 1990.

Professional boxing, or prizefighting, is regulated, sanctioned boxing. Professional boxing bouts are fought for a purse that is divided between the boxers as determined by contract. Most professional fights are supervised by a regulatory authority to guarantee the fighters' safety. Most high-profile bouts obtain the endorsement of a sanctioning body, which awards championship belts, establishes rules, and assigns its own judges and referees.