Of course, with the amount of spite the Phillies plays the Nationals, I would expect them to play like it's the 7th game of the World Series.
I would expect that only if they could hurt us by winning. (And by "hurt us" I don't mean keeping us from 100 wins, but knocking us out of the division lead, which is very unlikely). If they can't I fully expect them to lay down and play dead.