Games where there's such a huge disparity in talent scare me. Usually the intensity of the game ebbs somewhere mid second half because one team is so far ahead they turn it over to the second-teamers who are told to "run the offense" and the other team is so hopelessly far behind that they quit trying. As a result the game "compresses" into a game with narrower margins and there's no crush of points at the end that comes from late-game fouling to try to catch up. To hit the over and the spread Duke is going to have to put up at least 93, because you have to assume Pitt is going to manage 60 at best. That's a lot, even for Duke. So the bettor's logic is to take Pitt and the under.
Naturally I took the over.