This link is very relevant to this weekend's series:
http://www.wmata.com/about/met_news/...ReleaseID=1258
It doesn't really say much about Sunday's game ("...additional trains will be deployed if necessary...") but let's hope that Metro runs quasi-rush hour service (i.e. 3 min wait max) leading up to the game and after the 8th inning.
I agree with all the other posters: (1) Take the first train, (2) Metro will be jam packed, (3) Go to the South entrance, (4) Make sure you have enough money on your farecard for the return journey.
It's gonna be in the 90s all weekend!