Prediction - Whoever wins today's (Sunday's) game will win the Series.
Why? If the Giants win, they need only one more with either Lincecum or Cain pitching.
If Texas wins, the Giants need to win two more. The last game is Sanchez.

That means they would have to win when both Lincecum and Cain are pitching, and I don't think they can beat both Cliff Lee and CJ Williams twice.