Canada's George Chuvalo is widely considered to have the best chin in boxing history. He was never knocked down in 93 professional heavyweight fights, even against the likes of Muhammad Ali and George Foreman. In the build up to his second fight with Ali, 'The Greatest' predicted he would be the one to finally drop Chuvalo, saying: "I'm not gonna let it be said there was ever a heavyweight that didn't fall. They have pictures showing my heels. Jack Johnson fell, Jack Dempsey fell, Sugar Ray Robi

Watch this W5 interview from 1969, where Canadian boxer George Chuvalo talks about receiving an ultimatum before defending his title as heavyweight champion of Canada. | CTV News

49K views · 1K reactions | Canadian boxer, George Chuvalo preparing to fight Muhammad Ali in March, 1966 at Maple Leaf Gardens. Chuvalo was the first Canadian fighter to go the distance with the world heavyweight champion, yet lost by unanimous decision. | Old Toronto Series | Facebook