Ali, to save the sport of boxing all over again.

I'd agree with Hearns for exactly the same reason quoted above

Ditto for Ray Robinson

Sam Langford, just to see if he really was as good as everyone says. What's not in doubt is that he would be good enough to win one of the proliferation of Alphabet Belts out there, and thus right a historical injustice

Roberto Duran, to tear through the lightweights and to terrorise every fighter on the planet, regardless of their weight

John L Sullivan, to fight Tyson Fury in a bare knuckled brawl in a car park somewhere. That would be great to watch

I couldn't think of 10 straight away