#3 John Cena vs. Roman Reigns
The rumour section of Cageside Seats reported the following back in June: "John Cena vs. Roman Reigns is a feud that will be happening sooner rather than later, and WrestleMania 34 at the latest."
As Cena gets up in age and continues to land more acting roles, time is running out on a potential dream match between "The Champ" and Roman Reigns. In a lot of ways, Reigns is a reincarnated version of Cena as a polarizing star who is loved by most, hated by some and yet always elicits a strong vocal reaction from the crowd.
The prevailing thought is that Cena's new "free agent" status frees up him to eventually make the move to Raw, primarily in order to potentially build to a match with Reigns. Regardless of your thoughts on either star, it's hard to disagree with the belief that Cena vs. Reigns could be one of the biggest matches in WWE history.
That's exactly what it would be, and it would certainly be a downright shame if it doesn't happen before Cena hangs up his boots for good.