Two boxers, matched by weight class, land blows only with padded gloves. World titles are awarded by several independent sanctioning bodies, so one boxer can hold more than one belt at a time.
After the weigh-in and the referee's instructions, the bout runs over numbered rounds. Only the padded front of the glove above the belt line counts, and the judges score each round independently.
Gloves, mouthguard, groin protector and hand wraps. Headgear is used only in certain amateur and youth formats, never in professional world title fights.
Preliminary bouts run 4 to 10 rounds, major men's title fights up to 12. A round lasts three minutes, with one minute between rounds.
Joe Louis defended the heavyweight title 25 times and held it from 22 June 1937 to 1 March 1949 — according to Guinness the longest world championship reign in boxing.
| League | Teams | People |
|---|---|---|
| Professional Boxing – World Champions | – | 48 |
| Professional Boxing – Women’s World Champions (WBA) | – | 20 |