The list also includes champions certified by the National Boxing Association (NBA), the predecessor to the WBA.
[1] In December 2000, the WBA created an unprecedented situation of having a split championship in the same weight class by introducing a new title called Super world, commonly referred to simply as Super.
A Unified champion is a boxer that holds the primary WBA title and one or two from another major sanctioning body (WBC, IBF, WBO) simultaneously.
An Undisputed champion as defined by the WBA, only needs to hold three of the four major titles but in some cases they may change a Super champion into an Undisputed champion after a failed title defense (e.g. Anselmo Moreno losing to Juan Payano and Chris John losing to Simpiwe Vetyeka).
This is not to be confused by professional boxing's own definition of an undisputed champion, in which a boxer must hold all four major titles.