The term "pound-for-pound" was first coined by Ring magazine editor Nat Fleischer in the early 1950s as a way of comparing and contrasting fighters in different weight divisions. These days, with the plethora of weight classes, sanctioning bodies and titles, the phrase is used simply to describe a fighters raw talent and ability.
1hEthan Sherwood Strauss
3hKevin Van Valkenburg
14hAdam Schefter and Chris Mortensen