#2 Unfinished business with Roman Reigns
When The Undertaker lost to Brock Lesnar at WrestleMania, he would torment The Beast for months. He has surprisingly not done the same with The Big Dog yet. Could we possibly see a clash between Roman Reigns and The Undertaker for SummerSlam? Such a match would certainly sell a lot of tickets.
Remember how the crowd went away during the Roman Reigns vs. Samoa Joe match? They will not do the same if The Undertaker is involved in this mammoth contest. Moreover, The Undertaker could actually win this match setting up a rubber match for WrestleMania 35.
Who would win that big match? I hate to say it, but it would probably be Roman Reigns.