I don't think there is anyone ever that was so good there is no fighter you wouldn't consider beating them. Everyone except Marciano and Mayweather Jr. lost, and those two were/are undefeated because of the competition.
Ricardo Lopez and Sven Ottke were champions that retired undefeated as well.
I personally believe that the Bernard Hopkins that fought Glen Johnson can beat just about any MW in the history of the sport, Monzon and Hagler included.
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