#4 Brock Lesnar defeats Roman Reigns
Although Brock Lesnar is the most ferocious Champion in WWE’s history, he seems like the one who is carrying the belt until WrestleMania (to drop it). Fans are already speculating who will the next opponent for Roman Reigns once he dethrones the "Beast Incarnate" at WrestleMania 34.
Additionally, there are various reasons for WWE to part their ways with the current champion post WrestleMania. It will be a shock if he retains the Universal Championship. With that victory, he would literally have beaten the entire WWE roster. Not to mention, the entire push that the "Big Dog" has got from defeating the Undertaker and John Cena would go in vain.
This one is going to be a shock for which even WWE won’t be ready.