Oh awesome, so basically once the ball leaves the pitchers hand I should get an acceleration of around zero since it would just be velocity at that point.
Yeah, except that the data will be meaningless since you won't know which way is up, or rather I should say up is the only way you will know because if one the three axis reads 1 g then THAT axis is oriented with respect to gravity. If it reads - 1g it is upside down with respect to gravity. That is all you will know which eliminates quite a bit. A vector sum where two of the axis are zero would still be zero would it not ?