#1 The Demon King to slay the Beast
With the huge difference in the size of the two competitors, it is evident that Balor will have a tough time against Brock Lesnar. However, the same cannot be said for the Demon King. Since his NXT days, WWE has rightly protected the Demon King persona of Finn Balor, using it only for big matches. On the main roster, the Demon King is yet to be defeated.
Considering the monumental task to dethrone Brock Lesnar which wrestlers like Braun Strowman and Roman Reigns have failed to do, this will be the perfect time to bring back the Demon King.
However, the interesting part in bringing back the Demon King is the outcome of the match. While the previous two endings saw Balor on the losing end, the Demon King persona is what will be needed to slay the Beast.