#3 Aleister Black vs. Demon Finn Balor

We haven't seen Finn Balor as the Demon since TLC last year, while Aleister Black is still in NXT as the reigning NXT Champion. That said, this match is eminently possible as the year draws closer to its end.
Given how things usually go, a call-up for Aleister Black after SummerSlam is most probable. Since Shayna Baszler is likelier to go to Raw, Black is likelier to head to SmackDown.
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When Survivor Series comes around, and the brand warfare that goes around it, there would be no better match to open the show than this collision. Much like The Shield and New Day set the table last year, this match would open the show with spectacle and make the Raw vs. SmackDown feud feel important.
Aleister Black would benefit greatly from getting the Demon rub as well since Finn Balor has probably reached his ceiling at this point.