The Phillies clinched last night, which enables them to start Kyle Kendrick, who's been the least valuable pitcher in baseball this season, and also to rest all of their regular lineup. However, what that also means is that their game today now longer has any bearing on the playoffs. Which means, if it gets rained out, then MLB has no reason to play it Monday and they'll just cancel the game.
Canceling the game means that's it. No mas. No matter what Seattle does, they cannot pass Washington without a Nationals win.
If you have some sort of anti-rain dance, now would be the time to break it out.