#2 Randy Orton vs Keith Lee?
Keith Lee moved to RAW after he lost the NXT Championship to Karrion Kross at NXT TakeOver: XXX. Lee was one of the top stars on the Black and Gold Brand, and hit the ground running when he moved over to the Red brand in August of this year.
When Lee moved to RAW, he was immediately placed in the middle of the feud between Randy Orton and Drew McIntyre. Keith Lee lost his debut RAW match to Randy Orton following their confrontation on his RAW debut. The pair later settled their differences in another match at Payback, which Lee won, cementing him quickly as a talent to watch out for on RAW.
The rivalry between the pair has died down a little since then, but it could potentially be revived. Keith Lee is a strong and unique talent, and it is easy to see him chasing the WWE Championship sooner rather than later. Given how the personalities of Lee and Orton were showcased during their former rivalry, there is much potential for this feud to reignite.