The UFC adopted the concept of interim champions for two reasons: to keep the division running even if the current titleholder is unable to defend his belt (due to injury or any dispute) and to determine the next rightful challenger.
But the inevitable unification clash between the interim champion and the current champion soon follows to determine the undisputed king of the weight class. We've seen a few unification bouts in the history of UFC odds.
The bantamweight title rematch of Aljamain Sterling and Petr Yan, this April in UFC 273, is the latest addition to this list, as Yan, the interim champion, will look to reclaim his title against the reigning champion, Sterling.
However, there were massive MMA odds matchups in the past that delivered an all-time classic to unify the division's crown. Here's a list of the top five UFC title unification bouts.