#1 Sting vs The Undertaker

Well, it had to come up. For years, Sting vs The Undertaker was a dream match and when The Icon joined WWE in 2014, it seemed like we would finally get that match. But a neck injury in a match with Seth Rollins in 2015 forced Sting to retire, leaving this match on the table.
But recently, rumblings have begun again of making this dream match happen. One does not know how Sting's neck is holding up. But with Edge's recent return, the signs could be encouraging. And now, with Super ShowDown in February, Undertaker vs Sting looks like a possibility again.
The Deadman's last 'dream match' against a WCW legend in Saudi Arabia did not go well, with him and Goldberg, unfortunately, stinking the place up at last year's Super ShowDown event. Both men recovered from that debacle and put on much better performances in the summer.
If this match goes through, WWE will need to be creative to avoid another super disaster. They could gimmick the match in such a way that neither the fans' enjoyment nor the performers' health is compromised. But one thing is for certain - The Undertaker vs Sting would be a spectacle of the highest order. The entrances alone would be worth it.