#3 The Undertaker

The Undertaker's boneyard match with AJ Styles was nothing short of amazing and really stole the show on Night One of WrestleMania 36. Of course, maybe that was the point since the bout served as the last match of the evening, but it was still interesting to watch play out.
One of the most vexing questions when it comes to the Boneyard match is whether this is The Undertaker's last match or if this is just a new way to keep him going. Now, The Phenom could hold off on retirement and only appear in this matches, but that would rob him of a chance to go out on a high note.
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Maybe The Undertaker does have a few more matches in the cinematic world and keeps his legacy going that way. Although that would be an excellent chance way to capitalize on the character and maintain the relic of the past, there will arguably be no better send-off for The Undertaker than what he did in the Boneyard match.
A top WWE star is missing in action