#1 AJ Styles vs. The Undertaker

Prior to last year's Royal Rumble show in San Antonio, Texas, the biggest rumor going around was that The Undertaker was going to return and face off against AJ Styles. But, that didn't end up happening, as WWE decided to have The Deadman enter the 30-man Royal Rumble match instead.
For better or for worse, The Undertaker is still a part-time wrestler, even though his physical abilities have diminished significantly, which is to be expected from a big man who has spent nearly three decades in the pro wrestling business.
So, if he's significantly limited, the best person to put him in the ring with at next year's WrestleMania is someone who is just the opposite, and there probably isn't anyone in WWE who fits that bill better than AJ Styles.
Aside from a match with Sting, who is retired and probably never coming back, this is the biggest possible match WWE can do with The Undertaker at this point, so I'd be surprised if they didn't end up doing it when they head to MetLife Stadium next spring.
Did a WWE Hall of Famer predict John Cena's heelish ways long ago? More details HERE.