#4 Shane McMahon

This week on SmackDown Live, Commissioner Shane McMahon inadvertently cost AJ Styles his big match. He interfered in the main event between AJ Styles and Kevin Owens, to make sure that Sami Zayn wasn't a factor.
However, in doing so, he allowed Owens to pick up a win. The show ended with a piercing glare from Styles to The Commissioner. Many speculated at that point that the two men were on a collision course, for the Royal Rumble.
It is universally agreed that AJ Styles cannot have a bad match. Shane McMahon has proved that he can hang in there with Styles, to put on a decent showcase at a big stage. We're certain nobody will mind this clash, at the Royal Rumble pay-per-view.
Of course, there are some active wrestlers in the SmackDown Live roster, whom Styles can also face in a pretty solid match.