#1 The Fiend vs Randy Orton?
The Fiend moved from SmackDown to RAW during the most recent WWE Draft. The performer has most recently been a WWE Universal Champion but hasn't come near a championship belt since the move. The Fiend and Randy Orton being a new feud would be a great callback to their 2016-2017 rivalry that had fans hooked.
At the time, The Legend Killer was determined to infiltrate and destroy The Wyatt Family and did everything in his power to do so.
Randy Orton vs Bray Wyatt and The Wyatt Family spanned for months, and only ended when Orton burned the Wyatt Family compound to the ground.
A common theme with The Fiend is to target those who crossed or wronged him in the past, and Randy Orton definitely fits that description. Orton feels like the perfect person for The Fiend to target next.
The Fiend lost the WWE Universal Championship when Roman Reigns returned television, and may now have his eyes on the WWE Championship.
On the most recent episode of RAW, Orton was a guest on A Moment of Bliss, and later in the show, The Fiend appeared behind The Viper. The stage seems set for the pair to come to blows over the WWE Championship, which is sure to be a big hit with fans.