For all the championships and accolades Conor McGregor has amassed during his UFC career, a pair of non-title fights against Nate Diaz may still be what people talk about the most.
The rivalry sprung up out of necessity when Rafael dos Anjos was forced out of a title fight against McGregor and Diaz was selected as a late notice replacement. He then shocked the world by submitting McGregor in the second round by rear naked choke.
Five months later, McGregor exacted his revenge during a bloody back-and-forth battle with Diaz that ended in a majority decision win for the Irish superstar.