#1 United States Championship
The midcard titles, especially the United States Championship, often fall into the "one title must change hands on a pay per view" trope. Samoa Joe has already dropped the title once in the past month for little reason, so there's nothing stopping him from doing so again. WWE has never given the Samoan Submission Machine a major, extended push with a string of big victories.
Ricochet has been the surprise success story of the NXT call ups this year. It's entirely possible that WWE will want to keep that momentum going and give Ricochet the title. While it still feels early for Samoa Joe to lose it, dropping it to Ricochet wouldn't be the worst thing in the world.
The odds of this title changing hands are higher than any other on the pay per view. We'll consider the chances of a title change tonight at about 50/50.