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WASHINGTON -- The Washington Nationals have had trouble winning games since the All-Star Break. When they have come out on top, its been dramatic. Ryan Zimmerman homered with one out in the bottom of the ninth inning Friday night, lifting the Nationals to a 2-1 victory over the New York Mets for a doubleheader split. "Just worked into a good count and finally didnt try to do too much," Zimmerman said. "Good win. I mean obviously with Harvey starting its tough to get any runs, but (Ross) Ohlendorf stuck there right with him, and after the way that first game went, that was a huge win." After Washingtons second walk-off win in two days, struggling setup man Drew Storen was sent down to Triple-A Syracuse. The Nationals improved to 2-7 since the break. In the opener, Jenrry Mejia pitched seven scoreless innings in his season debut and Daniel Murphy homered twice and tied a career high with five RBIs as Mets won 11-0. Murphy had two hits for New York in the nightcap and went 6 for 9 in the day-night doubleheader. After Anthony Rendon grounded out, Zimmerman hit a 3-1 fastball from reliever LaTroy Hawkins (3-2) over the fence in right centre for his 12th homer of the year. The Mets wasted another impressive outing by Matt Harvey, who gave up five hits and an unearned run in eight innings. Rafael Soriano (2-2) pitched the ninth, surviving a first and third jam with one out. Jayson Werth added three hits for Washington. Manager Davey Johnson announced Storens demotion. "Theres (been) a lot of discussion about it, even before now, that maybe, hes never had failure, hes never had to deal with failure, and this is kind of a sharp lesson in dealing with failure," Johnson said of Storen. "I mean, we couldve done different things with different players, but I think its going to be best served for him to get it right and get it back." Storen is 3-2 with two saves and a 5.95 ERA. The Nationals activated reliever Ryan Mattheus from the disabled list Friday as the 26th man for the doubleheader. Storen entered the ninth inning of Game Five of the NL Divisional Playoff series in October with a two-run lead and gave up four runs as the St. Louis Cardinals ended Washingtons season. In the off-season, the Nationals singed free-agent closer Rafael Soriano. "I think theres a lot of things that led to this that couldve been prevented," reliever Tyler Clippard, Storens