Not the best but I thought Lucian Bute was a good fighter with good skills. I didn't expect Froch to run through him like that. Though he was Romanian.
George Dixion. 1st black champion of any professional sport. Considered by some as the greatest featherweight of all time.
Hard to tell since most of the boxers named were not born in Canada. Some of them, like Jean Pascal, came in Canada at early age, played hockey, and were typically, culturaly, canadian. Others, like Bute, came to Canada to have a better opportunity in their career. (Bute learned french and stayed in Québec afterall). I would have a hard time considering Beterbiev a canadian boxer (does he even have his citizenship?). But who am I to judge. Of all the fighters I saw from my own eyes, Beterbiev is hands down and by far the best fighter.