#1: Rey Mysterio
From what we've seen of Bray Wyatt's new character so far, it looks as though he is going to be the kind of thing that children's nightmares are made of, and if that is the case, then children everywhere are going to need a superhero to come along and defeat him.
Wyatt and Mysterio are two of the most accomplished performers on the Raw roster, and at this stage in his career, Mysterio should be all about putting over other performers.
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Wyatt is in need of a big win to get some momentum going, and having him defeat Mysterio over the series of a few good matches should help him achieve just that.
The two men are both incredibly competent in-ring performers and a feud between the two, especially one built around Wyatt's creepy new gimmick should be something fresh and interesting for both of these performers.