After a disappointing 8-4 loss last night to the Mets, in which Jerry Hairston Jr. made a critical error in left field the bottom of the 6th, the Nats hope to rebound and still cash in on their chance to get their first series victory of the season.
Today Washington will send out Jason Marquis in the series finale to help earn said series victory. In his last start, Marquis held the Florida Marlins to two runs on six hits in 6 1/3 innings.
The Nationals will be at a disadvantage, however, as they will be losing their most important player:
Ryan Zimmerman is out today after feeling his abdominal strain flare up on his slide into second last night. He'll be re-evaluated Tuesday.less than a minute ago via TweetDeck 
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Ben Goessling onMASN
masnBen
That's a huge blow to the Nats, who hopefully won't have to endure Zimmerman being out for any lengthy period of time. He is too important to the offense for him to be out more than a few games.