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Conor McGregor and Nate Diaz went to war twice in 2016.
There have been over 4,500 UFC fights from 433 events since the very first UFC show in 1993.
In the 25 years that followed UFC 1, fans have witnessed the rise and fall of many champions and seen many great fights - but which have been the best?
As part of the its 25th anniversary celebrations, the UFC has attempted to solve that riddle by tweeting its best ever fights on the Fox Sports: UFC channel.
A warning: these fights are bloody, violent, and filled with haunting knockouts and highlight-reel submissions.
If that is your thing, keep scrolling to see highlights from the 15 best UFC fights in history, ranked in ascending order according to UFC.