#3 Roman Reigns vs Braun Strowman
Circling back around to my earlier pick of Bray Wyatt, a potential rivalry with Braun Strowman would make just as much sense for Roman Reigns.
Another Superstar that Roman has a tremendous amount of history with, Braun Strowman is sitting pretty as the current WWE Universal Champion. Of course, it was never meant to be this way. It was originally Roman Reigns who was scheduled to face Goldberg at WrestleMania for the title, and if that match had happened as planned we would likely never have seen Strowman with the gold around his waist.
These two had a surprisingly good rivalry just a couple of years ago as they both brought the absolute best in each other. I, for one, would certainly love to see a repeat with the Universal Championship on the line.
When Roman Reigns returns to WWE, not only will he want to challenge for the Universal Championship, but he will also likely want to go after the man who took his opportunity.