When attempting to compare and rank the unbeaten streaks of various fighters it is essential to consider the quality of the opponents that they defeated. If this is not done, Nioklay Valuev’s 47 fight run would rank ahead of George Foreman’s 40 fight undefeated streak. With all due respect to the often underrated “Russian Giant”, this would be ludicrous.
So, determining the quality of each “opponent” is important. The fairest and most objective way to do this – in this writer’s opinion – is to judge each boxer against the standard of the era in which he fought.