3 - Finn Balor (Demon King) vs. The Undertaker

This match has been talked about ever since Finn Balor debuted the "Demon King" gimmick down in NXT, and the idea gained more steam after he debuted the character on WWE's main roster.
We obviously don't know when The Undertaker will retire, but it's probably pretty safe to assume that it's going to be sooner rather than later, so this feud should take place heading into next year's WrestleMania.
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Balor would make The Undertaker, who clearly isn't what he used to be, look as good as he's ever looked. Also, if Balor ends up going over, he'd be one of only three men to have defeated the "Deadman" at WrestleMania, which would certainly get him back in the main event scene in WWE.
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