Ricardo Lopez as a Strawweight, undoubtdly meets that criteria.

Carlos Monzon never looked like he was going to lose, maybe the first Valdez was close-ish

James J Jeffries dominated his era, he had trouble with Corbett, but still won both fights by KO.

Brian Mitchell with hindsight was a dominant undefeated 130lber, but he had the draw with Lopez.

As a Welterweight World Champion, Robinson was untouchable.

Michael Spinks totally dominated his era as Light Heavyweight World Champion.