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Washington, DC (Sports Network) - The Pittsburgh Pirates edged the Washington Nationals in the opener of a four-game series, 6-5, behind a pair of two-run homers from Andrew McCutchen.

The win may have come at a cost, though, as closer Jason Grilli exited in the ninth inning with an apparent arm injury.

Charlie Morton (2-2) gave up three runs on six hits in 6 2/3 innings of work to pick up the win, Pittsburgh's second straight after losing three in a row.

The victory didn't come easy.

Jayson Werth took Grilli deep for his second two-run homer of the night in the ninth to pull Washington within a run. Denard Span made it even more interesting with a one-out double, and Grilli exited with two outs after throwing a pitch to pinch-hitter Steve Lombardozzi.

Vin Mazzaro relieved the injured Grilli and induced a game-ending groundout to pick up his first save of the year.

Jordy Mercer and Russell Martin each had two hits and scored a run for the Pirates, who won despite going 0-for-10 with runners in scoring position.

Dan Haren (4-11) took another one in the loss column, surrendering five runs on five hits and one walk over his five-inning start. Haren has dropped his last eight decisions and the Nationals are 0-11 in his starts since mid-May.

Washington, which fired hitting coach Rick Eckstein on Monday, also received a solo blast from Adam LaRoche in addition to Werth's second consecutive multi- home run effort.

GAME NOTES:

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