#3 AJ Styles
As things stand, the final match of The Undertaker's legendary career was against AJ Styles. While the pair originally intended to have an in-ring classic at WrestleMania 36, the coronavirus pandemic forced WWE to get a bit more creative in the execution of this match. And thus, we got the Boneyard Match.
It was a phenomenal (pardon the pun) effort from both, Styles and Undertaker, as the fans witnessed the first of many cinematic masterpieces during this period. And while 'Taker is content and does not have any desire to wrestle again, the lure of having a crowd might pull him back in.
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The Undertaker might feel like putting a bow on his career with a match in front of tens of thousands of WWE fans, so the story with AJ could be continuing into next year's WrestleMania. It would definitely be the best possible retirement match Undertaker could have at this stage, with the Phenomenal One operating at a different level at the moment.
It would make sense for AJ Styles to have a rematch against The Undertaker, but a couple of other Superstars could get a larger rub from facing The Deadman in his final match.