#3 Kevin Owens/Sami Zayn

The reason that these two are grouped together is due to the fact that the outcome would possibly be the same and would somehow include the other in the title match at Wrestlemania 34 somehow. How WWE chooses to put that all together is up to them, but there is an extra element to this that could make the main event even more intriguing.
While most fans are intrigued at the possible dream match between Nakamura and Styles, adding Kevin Owens or Sami Zayn to the mix, even in a fatal four-way scenario, opens up the possibility of Shane McMahon and Daniel Bryan being inserted into the title storyline and raises the stakes as well.
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In fact, if Kevin Owens or Sami Zayn were somehow able to come out on top, which is at least possible due to the fact that Zayn betrayed his best friend to win the Fatal five-way match on Smackdown Live , it would be a great way to continue the tension between them and Shane McMahon and could even lead to some kind of screw job scenario at Mania.
Not only that, it also puts Owens and Zayn's deteriorating friendship in the spotlight and could lead to an interesting addition to their storied rivalry. Again, not as great as a one on one match between Styles and Nakamura, which is being heralded as the dream match of a lifetime, but it would be interesting in other ways that fans just aren't open to right now.
In the end, it would be interesting to see how their frinedlhsip ultimatley implodes during a title match at the biggest stage of them all and could even lead to one of them betraying each other and allowing Nakamura or Styles to walk out of WrestleMania 34 with The WWE Championship around their waist
Maybe WWE could even have Shane McMahon put his GM role on the line if Kevin Owens or Sami Zayn were somehow able to come out on top of Shinsuke Nakamura and AJ Styles at WrestleMania, which would add the perfect extra wrinkle to the match and up the ante for fans as well.