#1 AJ Styles vs Randy Orton

Why these two in-ring veterans haven't feuded already, despite being on the same roster for over 2 years now, is more baffling than Roman Reigns' booking. Both of them have been on the top of the ladder in that period, yet have only crossed path once, that also back in March 2017. Since then, the two have teamed together but have not faced each other in a lengthy, high profile program.
However, the way things have panned out so far in 2018, it seems inevitable to have these two face each other in the near future. Randy Orton is now a vicious heel who has promised to remove every fan favourite from the roster, beginning with his decimation of Hell in a Cell. Given that AJ is the biggest face on the Blue Brand, it is all but confirmed that Randy will target him sooner or later
The best way would be to have Randy either cost AJ his WWE Title to The Miz, or to have Randy betray Styles and Smackdown in their Survivor Series match. Not only will this create animosity between the two, it would create genuine interest among the fans for this rivalry. Both Randy and Styles have tremendous chemistry with each other, as evident from their solitary match, and it's time to end the year on a high note by having them produce magic inside the ring.