Orioles 6, Nationals 2: Jason Hammel continued his mastery of Washington with eight solid innings while Nick Markakis and Yamaico Navarro drove in two runs apiece as visiting Baltimore won the opener of the Beltway Series.

Manny Machado had three of Baltimore's 15 hits while Chris Davis, Matt Wieters (RBI), Adam Jones (RBI), Markakis and Navarro contributed two apiece. Hammel (7-2) yielded two runs, eight hits and struck out a season-high eight to improve to 6-0 in eight career starts against the Nationals.

Tyler Moore and Ryan Zimmerman drove in runs for Washington. Gio Gonzalez (3-3), who was 1-0 with a 1.67 ERA in his previous four May starts, allowed four runs, four walks and eight hits in 5 2/3 innings.

Davis walked and Wieters singled to open the third inning. With one out, Navarro fought off an inside fastball and served a soft line drive to left field for an RBI single to tie the game 1-1. After Hammel sacrificed the runners to second and third, Markakis delivered a two-run single to left-center.

Wieters' sacrifice fly made it 4-1 in the fifth inning before Washington's Denard Span tripled to lead off the sixth and scored on Zimmerman's one-out single through the right side. The Orioles restored their three-run lead in the seventh on Navarro's run-scoring single and made it 6-2 in the eighth on Jones' RBI hit.

GAME NOTEBOOK: Washington RF Bryce Harper did not play after reaggravating a left knee injury Sunday and is also expected to miss Tuesday's game. He could return to the lineup as the designated hitter Wednesday in Baltimore. ... The game was stopped at 3 p.m. ET when a moment of silence in honor of Memorial Day was observed. ... Markakis extended his hitting streak to 12 games and is 20-for-53 during that span, while Jones' home run streak ended at four contests.