tied 9th inning games

The Red Sox' lack of extra-inning games means that every time the game has been tied in the ninth inning, it has been decided in the ninth inning.  I can think of a number of walkoffs at fenway, and I remember one in toronto.  Additionally, the game tonight (Wed.) in Cleveland was decided in the top of the 9th.  Does anyone know or have the inclination to figure out how well the sox have done in games in which there was a tie going into the 9th?  I have a feeling it's a pretty good number, and it would also be interesting to see whether 'clutch hitting' continues to be an illusion as has been previously reported.