#3 Braun Strowman
John Cena has a history of humanizing monsters in The WWE and what better way to prove that Bruan Strowman is the company's next big thing then by putting him in a feud with The Cenation leader himself. Of course this time would have to be different and Strowman would have to pick up the win, but it would still be a great bout to witness!
Not only is this a way for WWE to show fans that they are serious about Strowman as a top guy in the company, it also gives him a win over one of the greatest superstars in the history of the business. Furthermore, it is something fans will pay to see, especially with the high stakes involved between the two, and be a great match for later in the year.
Sure, WWE might have to allow Cena to win one of the fights to keep things interesting, but they could easily do that in a way that makes Strowman look strong in the process and then give Strowman two surprise victories over The Cenation leader later on.