#3 Finn Balor
Remember when this match was being discussed by one and all in the WWE Universe? Ultimately it was deemed that Balor wasn't over enough to face off against The Beast.
I suppose the size difference was considered way too much of a factor, and the eventual contest would not have been believable. Yet, there is an exception to this premise.
The Demon avatar has been protected, and how. It has not been pinned on the main roster yet. Balor scored victories over top tier superstars like Seth Rollins, AJ Styles and Baron Corbin, as the Demon. It would be a formidable opponent for Brock Lesnar.
Whether or not Balor can actually go over Lesnar is not really the question. It would make for an intriguing contest and as they say, 'every ticket is sold before the bell rings'.