1. The Undertaker
It's undeniable that the match that everyone would want to see from Sting in a WWE environment is versus The Undertaker. Of course, The Undertaker is likely physically the worse for wear after his tilt with Brock Lesnar at WrestleMania 30, so that's not going to happen. It's impossible to even imagine how many times the roof would come off the building just in the build to The Undertaker and Sting at WrestleMania. Of course, regarding the match itself? Sure, from an in-ring standpoint it would be a little rough, but between two veterans with sixty years of combined in-ring experience, figuring out how to accentuate each other's strengths shouldn't be too difficult.