#3 Kevin Owens
While he may not necessarily walk away as the man with the briefcase, there is no reason to believe he won't contend for it near the end. As it stands, he is the current United States champion, and regardless of what he does during the match, he will still be champion at the end of it.
However, to have the distinction of not only being the United States Champion, but the Money in the Bank contract winner would be something fans more than likely wouldn't anticipate. He would essentially get to have his cake and eat it too.
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He is currently embroiled in a feud with AJ Styles, and that could ultimately impact the end of the match. However, the pomp and circumstance of his arrival have certainly suggested he will be elevated to a prominent position.