In week 1...I think that's gotta be James Madison "upsetting" East Carolina. I almost wouldn't even call that an upset though, although technically by division level, it is.
Other "decent chances" at an upset:
Fordham @ Army
Eastern Washington @ Texas Tech
Cal Poly @ San Jose State
Northern Iowa @ Iowa State
Youngstown State @ Pitt
Albany @ Old Dominion
I don't think any of these would "blow my mind" if the upsets happened.
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