I understand Rocky's record as retiring undefeated and Mayweather most likely tying and big ado about it.
But is it the fact that they retired undefeated that is the big deal as it can't be the winning streak.

Chavez had to be 87-0 before losing
Duran was around 40
Monzon was like 80 or so.
Pep (not sure without ggogling but he was way up there.
Sure there are lots I am not thinking of.

I remember when Shane fought Mayweather he made a comment similar to 'yeah, I went 42-0 before my first loss too' That is not a direct quote, just from memory.

So is a fighter greater that retires with a winning streak of 49-0 or one like Chavez that had 80 straight and then lost? (Chavez just an example as I know he had some bums handed to him but who hasn't)

Just a thought on how important retiring without a loss is vs wins without a loss.

Keep in mind I am a fan of both the Rock and Mayweather (Please don't hate me) But looking back at past fighters how great is 49-0?