1: Saul 'Canelo' Alvarez — 53 wins (36 knockouts) against one loss and two draws.

Weight class: Middleweight, super middleweight, and light heavyweight.

Nationality: Mexican.

Why he's ranked: If weight classes were a dart board, you could drink a few beers, put on a blindfold, and throw an arrow, and chances are you'd hit a weight class that "Canelo" holds a championship belt in.

Alvarez only has one official loss on his record, a 2013 defeat to Floyd Mayweather when he was a light middleweight champion at 23 years old.

In the years since, "Canelo" has beaten Miguel Cotto, Daniel Jacobs, and Sergey Kovalev, and holds a disputed two-fight rivalry win over Gennady Golovkin.

Alvarez is so good, he could fight pretty much anyone at middleweight, super middleweight, and light heavyweight, and win — something he is proving right now.

Championships won: Simultaneous champion of two weight classes, as well as world titles at light heavyweight and junior middleweight.