Orioles 8, Nationals 2 (11): Chris Davis belted a tiebreaking two-run homer to ignite a six-run 11th inning and Manny Machado had a career-high five hits with a two-run blast to power visiting Baltimore in the opener of a four-game, home-and-home interleague series.

Nelson Cruz swatted a two-run homer among his three hits, Nick Markakis had three hits and an RBI double and J.J. Hardy clubbed one of three homers in the 11th to lift the surging Orioles to their seventh win in eight games. T.J. McFarland (2-2) pitched two scoreless innings as Baltimore improved to 8-3 in extra innings.

Anthony Rendon hit a two-run homer and Wilson Ramos added a pair of hits as Washington fell to 7-2 in its last nine games. Craig Stammen (0-4) was battered for five runs on five hits in two-thirds of an inning, dropping the Nationals to 2-8 in extras this season.

Both teams received stellar seven-inning performances from their starters. Orioles right-hander Chris Tillman gave up two runs on five hits with six strikeouts while Stephen Strasburg fanned nine and permitted two runs on four hits.

Machado led off the fourth with a single and, one out later, Cruz continued his torrid streak with a blast to right-center for his major league-leading 28th homer, surpassing his total from a year ago. Washington finally broke through against Tillman in the sixth when Rendon followed Denard Span's leadoff single with a shot to right-center for his 13th homer.

GAME NOTEBOOK: Cruz is 11-for-16 over his last three games while Machado, who has six multiple-hit games in his last 11, is 10-for-17 over his past three. ... Nationals OF Jayson Werth on Monday was named the NL Player of the Week after going 9-for-20 with two homers, five doubles and nine RBIs. ... Orioles 1B Steve Pearce, who was named AL co-Player of the Week along with Baltimore CF Adam Jones, was not in the starting lineup due to an ailing hamstring but flied out as a pinch hitter. Pearce was 10-for-30 with three homers and nine RBIs while Jones was 11-for-26 with a pair of homers and five RBIs.