I'm calling it now:
By the law of Nationals performance of inverse common sense, we should hang 5 on their 2.3 ERA starter and knock him out by the 4th, then get shut down the rest of the game against a string of their worst 6+ ERA relievers while Perez falters and gives up 3 in the 5th. One of our relievers will then give up a 3-run jack, and the Pads will get an extra insurance run somehow in the 8th just to crush any remaining hopes we had. This is all while we're still being shut down by Joe Sixpack. Final score - Pads over nats, 7-5. Khalil Greene will somehow figure prominently in the final outcome.
We'll probably also be outhit by a roughly 2:1 ratio. If I had to guess I'd say 15-7.