Oswalt vs. Sanchez tonight in South Philly. Won't go so far as to call it do-or-die for the Phils, but it kind of is.

[T]here seems to be a feeling that Oswalt vs. lefthander Jonathan Sanchez favors the Giants.
Certainly, Sanchez has been difficult on the Phillies, and the 27-year-old apparently has found the consistency and poise that had prevented him from becoming a dominating presence. He has the stuff - a fastball that's consistently in the mid-90s and a breaking ball that's simply unhittable when he's right.
Giants manager Bruce Bochy is so eager to match Sanchez against the Phillies' lefty-leaning lineup that he moved him up to Game 2 and dropped righthander Matt Cain to Game 3. The move also allows the Giants to go lefty-righty-lefty-righty in the first four games of the series. [Philadelphia Inquirer]