SEATTLE — Clay Buchholz pitched seven solid innings, Victor Martinez hit a two-run double and the Boston Red Sox beat the Seattle Mariners 5-1 on Wednesday night to complete a three-game series sweep.

Buchholz (16-7) allowed one run — Russell Branyan’s first-inning homer — and four hits in his first victory since Aug. 22. The All-Star right-hander was 0-2 with a 5.40 ERA in his previous three starts.

Buchholz did not allow a hit after Chone Figgins’ two-out single in the third. He lowered his ERA to 2.48, second in the American League.

David Pauley (2-8) tossed six strong innings for the Mariners, who have lost seven straight. The right-hander gave up two runs, one earned, and six hits.

Seattle had a chance to add to its 1-0 lead in the second, but the rally was stymied by Martinez. The Mariners put runners on second and third with no outs, but Martinez picked off Casey Kotchman at third with a nice snap throw from behind the plate.

After Michael Saunders walked, Buchholz got Adam Moore and Chris Woodward to ground out to end the inning.

Martinez also threw out Figgins trying to swipe second in the third inning, denying him his 40th stolen base.

Adrian Beltre hit his 28th homer in the fourth and the Red Sox grabbed the lead in the sixth, taking advantage of an error by second baseman Figgins. With two out and David Ortiz on third, Figgins let Yamaico Navarro’s grounder bounce through his legs untouched for an error.

Martinez added his two-run double in the seventh against Ryan Rowland-Smith, and Ryan Kalish tripled in Marco Scutaro in the eighth.

Scutaro had three hits and Kalish went 2 for 5 for Boston, which finished with 10 hits.

Kotchman went 1 for 3 against Buchholz, leaving him 6 for 9 in his career against the righty.

Beltre swung so hard on his two-out drive that he dropped to one knee and rested there momentarily to watch the ball sail into the second deck in left field. It traveled an estimated 391 feet.

NOTES: Mariners RHP Sean White hasn’t pitched in 12 days because of a sore right forearm. “We’ll let the doctors look at him and go from there. We don’t think it’s anything serious,” manager Daren Brown said. … Red Sox RF J. D. Drew missed his third straight game with a sprained ankle.

Nationals 4, Braves 2

ATLANTA — Light-hitting Justin Maxwell’s grand slam off rookie Mike Minor in the second inning powered the last-place Washington Nationals over Atlanta 4-2 Wednesday and sent the Braves to only their second home series loss this season.

John Lannan (8-7) gave up two runs, eight hits and three walks in six innings for the Nationals, who have won eight of 15 meetings with the Braves this season. Joel Peralta, Sean Burnett and Drew Storen combined for two-hit relief, with Storen pitching a 1-2-3 ninth for his fourth save in five chances.

Atlanta, which began the day two games back of NL East-leading Philadelphia, lost two of three to Washington, only the second series in 24 at Turner Field this year the Braves lost (19-2-3). Atlanta split four games against St. Louis during a 3-4 homestand but still has the major leagues’ best home record at 52-23.

Maxwell was hitting only .132 (10 for 76) with six RBIs before his drive off Mike Minor (3-1) stayed inside the left-field foul pole and went about 10 rows deep. It was just the third homer of the season for Maxwell and ninth of his big league career — but he has three slams in four career at-bats with the bases loaded.

Mike Morse had a one-out double to center, Wilson Ramos singled and Alberto Gonzalez fell behind 0-1 before taking four straight balls.

Minor’s ERA climbed from 5.63 to 5.84 as he gave up four or more runs for the third straight start. He allowed four hits in five innings, and struck out six.

Troy Glaus walked in the fourth, moved to third on a double by Matt Diaz and scored on Melky Cabrera’s groundout. Prado’s fifth-inning single drove in Omar Infante, who led off with a double.

Atlanta wasted scoring chances in the sixth and seventh innings.

Lannan struck out David Ross with runners on first and second to end the sixth.

In the seventh, pinch-hitter Eric Hinske was credited with a leadoff double when centerfielder Nyjer Morgan lost the ball in the sun. Hinske was stranded at third when Burnett struck out Martin Prado.

NOTES: Atlanta lost two of three to the Phillies from April 20-22. … Washington manager Jim Riggleman said he isn’t sure when Morgan will hear the determination of his appeal of seven- and eight-game suspensions.