Foreman first became world heavyweight champion in 1973 when he knocked out then-undefeated Joe Frazier, before going on to have a legendary fight against Muhammad Ali in the ‘Rumble in the Jungle.’
Ali won that by eighth round knockout, with Foreman then initially retiring in 1977. He returned after a ten-year absence, and went on to become world heavyweight champion again when he knocked out Michael Moorer in 1994.
That win saw Foreman become the oldest world heavyweight champion in history at the age of 46 years and 169 days old, before he finally retired in 1997.
Another heavyweight icon during the 90s was Tyson, who had first become world champion in 1986 at the age of 20 years and 145 days old, making him the youngest heavyweight champion ever.