#2 AJ Styles
Depending on whether or not his injury will require him to be out of action for an extended period of time, AJ Styles could be next in line for a shot at Seth Rollins' WWE Universal Championship. Judging from this past Monday's show, where Baron Corbin attacked AJ Styles, it's very likely that WWE will book a number one contender's match between Corbin and Styles at some point in the very near future.
Of the possible opponents for Rollins after next week's Super ShowDown, Styles is clearly the best choice, but it might not be in the cards if his health isn't up to snuff. Of course, we're all hoping that this is a short-term injury that will only keep Styles out of action for a few weeks.
As we've all seen, Rollins and Styles are more than capable of having a fantastic match with one another, and one would assume that the quality of their matches will only get better the more times they're able to work against each other.