Who is the world's best fighter, regardless of weight class? Check out ESPN's top 10, which was cracked by Guillermo Rigondeaux this week and could receive another new entrant (Canelo Alvarez? Abner Mares?) in short order. If you have a comment about the rankings, please use #ESPNP4P on Twitter.
Don't forget to check out Dan Rafael's divisional rankings, which are updated weekly.
For a list of the current champions in all weight classes, click here.
Note: Results are through April 15.