#5 Alexander Gustafsson
Jones already fought Alexander "The Mauler" Gustafsson at UFC 165 in 2013. It was a notable fight, given that it was the first time the MMA world has seen "Bones" in a vulnerable state where he was battered, bloodied, and was in legitimate danger of incurring his first real career loss.
Through three rounds, Gustafsson was slowly picking the then-champion apart, but through grit, experience, and skill, Jones slowly clawed his way back into the fight to win the close decision.
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The former top pound-for-pound fighter in the world later admitted that he did not put all his efforts in during his training camp for the Gustafsson fight, so it would be interesting to see how he would do if he did.