I think guys like Robinson and Armstrong beat 40+ ranked opponents. Obviously Pac and PBF haven't that many, but are they in the vicinity of for example Ali and Louis with 30+? Anyone bothered to make a count?
I did something a few years ago. got bored of it but this was what I had back then: http://www.boxingforum24.com/thread...ition-who-have-featured-in-the-top-10.337817/