#2 Bray Wyatt vs The Undertaker

Keeping with the WrestleMania 31 theme, Bray Wyatt and the Undertaker had a painfully sub-par match that evening. It was the Deadman's first WWE appearance since the Streak died a year ago. 'Taker got the better of Wyatt in 2015 not once, but twice. The Brothers of Destruction handily defeated the Wyatt Family at Survivor Series of that year, in celebration of 25 years of the Undertaker.
That means we have some meaty history which could come into play, as "The Fiend" surveys his next targets. This would be an incredible spectacle if nothing else. The Deadman looking across the ring to see the new, and this time for real, Face of Fear.
The match wouldn't even have to be good, as long as the story is told effectively. There's something about The Fiend retiring the Deadman that just makes it sound perfect. Bray Wyatt could even use the 'Heal' glove to end The Undertaker, to symbolize him healing from all the pain he has suffered in a WWE ring.
Whether or not the Undertaker decides to finally retire, putting over new stars is something that he would certainly be keen on doing. Also, The Fiend should have a title reign longer than five months before the inevitable title change with Roman Reigns. Give that some more time.