#1. Conor McGregor
While this may be a long shot, considering Conor McGregor's past comments about the WWE, which were not particularly good, we all know that McGregor likes money. If Vince McMahon and co. can tempt the Irish star with big bucks, much like Brock Lesnar, he would be one of the biggest coups in sports entertainment.
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McGregor is perfect for the WWE - he's athletic, quick, and can trash talk till the sun comes up. He also has an underdog story that fans will back and love him for.
McGregor recently announced his retirement from MMA, and while many don't buy the Irishman retirement announcement, this could perhaps be a way for him to do other things before he returns to the Octagon once again
Finn Balor teased a McGregor appearance with a reply to his retirement tweet, telling his fellow Irishman that he will see him at Mania!