Whenever you are dealing with a game that consists of a pitcher making his major league debut (and there are mixed reviews on him) coupled with another young pitcher whose recent performances have drastically deviated from his true worth, and oddsmakers are put in a tough position when opening a line in such a game, and prone to setting line with high disparity with market perception.
The market clearly thought oddsmakers were off with the opening price, but I will be interested to see where this line closes. I am expecting continued buy-back on the Tigers until first pitch.