#4 Finn Balor vs Baron Corbin

Well, if any match on the main card where to be moved to the kick-off show, it's this one. While it could go in anywhere as a bumper, I'm sticking it at the start. Balor will get a pop, and we can get the match out of the way.
That's no knock on these two talents. Finn Balor is incredible. Before his injury, he was arguably one of the best wrestlers in the world. His ability hasn't changed, but Balor's instant push on Raw where he became the top guy and even won the Universal Championship, becoming the first man ever to do so, seems to be falling into the same kind of territory as Seth Rollins did for the best part of a year after his recovery - and much like this feud, Balor's position in WWE seems to be becoming slightly stagnant.
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On the contrary, Baron Corbin's character has been completely revitalized since he became Constable Corbin. A shaved head and some new attire seem to have worked wonders for refreshing The Lone Wolf.
While this feud has been nonsensical at times - with Balor mocking Corbin's appearance, and Corbin mocking Balor's height... Despite running away from Balor last week and into the ring with a much bigger man in Roman Reigns - it is somewhat tensely stacked at 1-1 with SummerSlam being the rubber match and hopefully the culmination of the feud.
Match prediction: A strong showing for both men but Balor shines through and picks up the win with the Coup de Grace - and hopefully we move on afterward and Balor goes on to bigger and better things, and Corbin turns his attention elsewhere.
Match length: 15 minutes. Enough time for these guys to put on a decent match while, again, not letting the crowd get too bored.