They wouldn't bat an eyelid. Andy is no threat to them on current form. If Andy is, as expected seeded outside the top 8 seeds for Flushing then he'd be seeded to play a top 8 player in the last 16 and when was the last time Andy beat a top 8 player??
But they are probably savvy enough to know that Andy's current form is not necessarily the form which will appear at the USO. Did Novak expect Robredo to knock him out in the 3rd at Cincy?