#2 Randy Orton vs. 'The Fiend' Bray Wyatt possibly for the WWE Championship

This may or may not be for the WWE Championship, depending on whether Randy Orton defeats Drew McIntyre inside Hell in a Cell. After the event, he could immediately become a target of The Fiend. Bray Wyatt's alter-ego is based on avenging those who wronged him in the past, something nobody has done more so than the Viper.
Orton might be responsible for the ultimate creation of The Fiend, as his infiltration of the Wyatt Family sent the 'Eater of Worlds' into a downward spiral. He turned on Wyatt, burning his house down in the process. In that house were the ashes of Sister Abigail, Wyatt's biggest motivation throughout his WWE career.
This led to their disappointing WWE Title match at WrestleMania 33, which Orton won. Wyatt never truly recovered until The Fiend debuted on WWE TV and since then, he has been one of the top stars in the company. Now that he is on RAW, the path towards vengeance is clear. Alexa Bliss could direct proceedings for her new supernatural partner.
Wyatt went through a lot of mental anguish at the hands of Randy Orton so expect a storm of mind games to head the Legend Killer's way whenever these two feud. For him to truly 'heal', Bray Wyatt must destroy the Superstar who 'hurt' him the most.
He could possibly even take the one thing that was taken from him at WrestleMania 33, the WWE Championship, in the process.
It would represent a prophecy being fulfilled.
Becky Lynch has been challenged HERE.