#2 Brock Lesnar (c) vs Demon Finn Balor/Finn Balor
Finn Balor has already stated he will not bring his demonic persona at the Royal Rumble PPV. This has further reduced Balor's chance of winning the Universal Championship. With that being said, WWE can build an interesting narrative from this match. Balor with all his might will try to slay Lesnar only to fall prey to him in the end. This will ignite a fire inside an otherwise smiling babyface and will force him to bring out The Demon residing inside him.
Balor disguised as Demon King can enter the Rumble and end up winning it. He has stayed on the sideline for far too long in his main roster career both due to injury and dismal booking. With this step, WWE can make Balor the biggest superstar in the entire WWE. Demon Finn Balor versus Brock Lesnar has all the crucial things needed to be worthy of a WrestleMania main-event spot.
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It is almost certain that Lesnar is going to leave Royal Rumble as champion. It is also hard to argue that WWE is changing themselves for good in the recent times. If the company takes the risk of pulling the trigger on Balor's push then the Universal Championship match at 'Mania can turn into a rematch.
Whilst WWE has ended the contractual rematches in this new era, Lesnar can still demand one. To add more heat Vince may grant it as he was not happy with a superstar of Balor's size running his flagship show against which Triple H can defend Balor and his ability. This will create their rematch at WrestleMania 35 even more intriguing.