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Morton called his early season results “frustrating,” but said he’s encouraged now because “I’m doing a better job of pitching.”

Zimmerman and Dunn singled in runs in the sixth against right-hander Joe Martinez, who pitched three innings after being called up from Triple-A Indianapolis.

Washington’s bullpen followed Marquis with three scoreless innings, two by Tyler Clippard and one by Drew Storen.

Notes: The Pirates unveiled a statue of Hall of Fame second baseman Bill Mazeroski in pregame ceremonies. … Riggleman returned after serving a two-game suspension for his role in last week’s brawl against Florida. … Washington won five of six in a season series noteworthy for Stephen Strasburg’s 14-strikeout debut on June 8. … The Pirates‘ 91st loss, with 26 games remaining, was their seventh in nine games. … Pittsburgh would trail Washington by 13½ games if the two were in the same division. … Pittsburgh committed three errors. … Pirates LF Jose Tabata had two hits despite being struck in the left hand by a Marquis pitch in the first.