greatest - Escalera I & II(the rematch was more exciting in my opinion, but the first fight was vicious)
Worst - Pryor(what can you do when you hit a man with punches that would normally put your opponents to sleep and he just smiles, like Leonard said Arguello faced a different animal in Pryor)
Roberto Duran's best performance was his destruction of Davey Moore in winning his third title. Davey Moore - to say the least - was never the same after that...
His worst fight is a tie between the "no mas" debacle in New Orleans and the 2-round demolition at the hands of Tommy Hearns.
Lesser favorites:
Muhammad Ali's best vs. Cleveland Williams; worst vs. Larry Holmes, who took the wings off the butterfly and the sting out of the bee...
Mike Tyson's best vs. Trevor Berbick; worst vs. Buster Douglas, arguably the biggest upset in the history of boxing...
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