Who is the world's best fighter, regardless of weight class? Check out ESPN's top 10, which nearly got a shake-up when Timothy Bradley Jr.'s chin was checked by Ruslan Provodnikov. 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 March 18.