The last year was an interesting one, to say the least, for the sport of boxing. Floyd Mayweather fought an undeserving Andre Berto in his 49th fight, and “retired.” At the end of November, Wladimir Klitschko put his three heavyweight titles and the lineal heavyweight championship on the line against Tyson Fury, and lost. While Floyd’s retirement was predictable, given he had reached the pinnacle of the monster contract he signed with Showtime in 2013, most fans and media didn’t see Klitschko ’s historic run of dominance coming to an end just yet. Regardless, these two events opened up what had been major logjams, both at the top of the sport and in boxing’s two glamour divisions as well (Heavyweight and Welterweight).

As we head into the spring and summer months of 2016, boxing is on the precipice of a new era. Exciting matchups between young, prime, talented fighters are on the horizon in almost every weight class. And while we could go on about all the fascinating possible fights in each division, that’s not what we’re here for.

Here is A Definitive Ranking of Boxing’s Weight Classes.