Hailed as Muhammad Ali’s toughest opponent, his biggest fight was outside the ring

Boxer George Chuvalo was a gladiator of the ring, an unrelenting fighter with one of the toughest chins in the sport. With few interruptions, he held the Canadian heavyweight title for nearly two decades, going head-to-head with some of the biggest names of the 1960s and ’70s: Muhammad Ali, Joe Frazier, George Foreman, Floyd Patterson.