Dillon Gee allowed three home runs - one to each of Ian Desmond and Denard Span in the second inning and a two-run home run to Bryce Harper in the third inning.
Daniel Murphy led off the ninth with a single off of Rafael Soriano, but the Mets couldn't get a rally started.
Dan Haren allowed three singles in seven innings to the Mets.
David Wright had two hits and an RBI against Haren.
For a full recap and box score, check out SNY.TV.
The game came down to three mistakes by Dillon Gee and no offense from the Mets. It's amazing the Mets have outscored Washington 13-6 in this series and lost two of the first three games of this series. What a funky game this is...
Gee pitched well but was bitten by the home run ball on three separate occasions. While there were some other hard hit balls against him over the course of the day, but he threw strikes, kept his pitch count low and really pitched a better ballgame than it seemed. Unfortunately, the Mets offense had no answer for Dan Haren, who for whatever reason was able to pull a rabbit out of his hat and pitch really well. They looked flat and lifeless at the plate for a second game in a row, which is frustrating considering they walloped the Nationals in the first game of their doubleheader and have been pretty consistent at the plate over the last few weeks.
The Mets will look to salvage a series split with the Nationals tomorrow afternoon in Washington, with Carlos Torres facing Taylor Jordan at 1:35 pm.