#1 Alistair Overeem
If you don't know who Alistair Overeem is, then we suggest you Google the guy. The Dutch fighter was Brock Lesnar's final fight in the UFC before the Beast Incarnate swapped the Octagon for the squared circle, and as such, we can't imagine the two are the best of friends to this day.
If Lesnar is already in the ring when Overeem's number is called or vice versa, we could be in for an absolute war.
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A lot of the audience will probably know who he is, and for the fans at home, the likes of Michael Cole and Corey Graves can fill them in on Overeem's past with Brock. He's big, he's intimidating and he could even get an extended run in professional wrestling out of it. God knows he's certainly got the right physique.
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