I never understood the whole "he retired undefeated, so therefore he's the greatest" thing. Going 49-0, even if it wasn't against great compedition, is impressive as hell.

But does that mean Sven Ottke is one of the best of all time? If Valuev would have retired after beating McCline, with a comparable record of 46-0 and 14 years of boxing under his belt, would he be considered even in the top 20 of all time?