WASHINGTON — The Orioles doubled up on the Red Sox, 4-2, at Oriole Park at Camden Yards Saturday with Baltimore now winning four straight games.

The first-place Orioles, powered by home runs by Trey Mancini and Jonathan Schoop, helped Jayson Aquino pick up the victory in his first major league start.

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The lefty went six innings, allowing just two runs over his time on the mound.

Aquino, 24, who broke in with the Rockies organization in 2010, was a reliever for the Orioles last season after playing for several minor league teams the last several years.

“It’s been a tough process. I’ve been through a few organizations right now,” Aquino said through a translator. “But I’m just thankful to the Orioles for this opportunity and allowing me to start a game at the major league level.”

Darren O’Day picked up his first save of the season since closer Zach Britton is on the disabled list with a forearm strain.

Britton will see a specialist Monday following a MI that came back clean.

Mancini has eight home runs this season in 17 games, which ties a major league record with Trevor Story and Carlos Delgado.

Sunday, (1-1) Kevin Gausman makes his fifth start of the season at 1:35 p.m.

Baltimore has not lost a series this season.