#2 Roman Reigns vs The Rock
Fans have been clamouring for a Roman Reigns heel turn for a long time. It's probably time to accept that a full heel turn isn't going to happen, since he actually functions better as a polarizing tweener. But if there's one match where he would be a clear heel, it would be in a matchup with his cousin, The Rock.
The Rock hasn't had a real WrestleMania match (no, Erick Rowan doesn't count) in a few years. With him still being on the WWE roster and being perhaps the biggest star in the history of the company, they would be smart to bring him back eventually. And why not throw him in the ring with someone who's not only a family member, but who could acquire nuclear heat for defeating one of the most beloved superstars ever?
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The story could be a great one. The Rock returns at some point to talk to Reigns and congratulate him on his success, Reigns says he never needed praise or help from the Rock, and everything escalates from there.
It would have a ton of tension and emotion behind it. Their match would tear the house down with the deafening cheers for The Rock, deafening boos for Reigns, and the awesome story they would tell in the ring.