Wang's sinker will be very good tonight This is a sharp move by the Yanks, IMO.
Full strength pitchers with live arms get great extension with their arms out in front, making the sinker break later, sometimes too late - and it "hangs".
A tired arm will get less extension out front, he may short arm the ball a bit more, allowing the sinker to break earlier in it's path to the plate.
Mussina is a veteran. You put him on the road in that Cleveland atmosphere in the decisive game, and let the young guy pitch at home.