Boxing in the 1950s beaten by Pérez), won Japan's first world title, and Hogan Bassey won the first belt for Nigeria. Popular American fighters in the 1950s proved legendary: Sugar Ray Robinson would still win (and lose) world titles, Rocky Marciano became the only heavyweight world champion in history to retire with perfect record. Jersey Joe Walcott the oldest heavyweight champion (until George Foreman regained the title in 1994), Archie Moore broke the all-time knockout record as well as the record for the oldest champion, at 48, for "any" division, Ezzard Charles proved to be a reliable substitute for Joe Louis as heavyweight champ,
Michael Moorer Swindell, Mike Sedillo and former WBA champion Leslie Stewart, among others. In 1990, he retained the title three times before the end of the year, beating Mario Melo and former Michael Spinks challenger Jim McDonald, among others. 1991 saw Moorer move up to the heavyweight division. He rolled through the competition en route to securing an opportunity to fight for the vacant WBO heavyweight championship the following year against Bert Cooper. Moorer stopped Cooper in the fifth round after both fighters were down and hurt during the bout. He did not defend the lesser regarded WBO heavyweight belt. Moorer and