OAKLAND, Calif. (AP) Chris Davis hit his second grand slam in 12 days with one out in the top of the 10th inning and the Baltimore Orioles beat the Oakland Athletics 7-3 on Wednesday.

Davis hit 28th home run and third in four games on a 3-2 pitch from Arnold Leon (0-1). It came two batters after Gerardo Parra was intentionally walked to load the bases. Caleb Joseph and Manny Machado led off the inning with back-to-back singles.

It's the sixth grand slam of Davis' career. He also hit one against Tampa Bay on July 25.

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The Orioles trailed 3-1 before scoring twice in the sixth.

Closer Zach Britton (2-0) pitched a season-high 2 1/3 scoreless innings for the win.

Marcus Semien had two hits and two RBIs for the A's.

Nolan Reimold snapped an 0-for-9 skid with an RBI single off Oakland starter Kendall Graveman in the third.

The A's tied it on Brett Lawrie's sacrifice fly in the bottom of the inning.

Semien, whose three-run homer sparked a 5-0 win on Tuesday, put the A's up 3-1 with a two-run double off Wei-Yen Chen in the fourth.

Chen allowed three runs and four hits over five innings. He walked four and struck out four.

Jimmy Paredes hit an RBI single in the sixth to pull Baltimore within 3-2, two batters after center fielder Billy Burns made a leaping catch to rob Adam Jones of a home run. J.J Hardy followed with a single to drive in Davis with the tying run and chase Graveman.

Graveman struck out three and walked one in 5 2/3 innings.

TRAINER'S ROOM

Athletics: OF Coco Crisp was scratched from the lineup with a sore neck. He grounded out as a pinch-hitter in the ninth. . RF Josh Reddick also did not start after sitting out Tuesday's game with stiffness in his lower back. Reddick drew a walk as a pinch-hitter in the seventh.

UP NEXT

Orioles: RHP Kevin Gausman (2-2) will go for Baltimore Friday in Anaheim and is looking to win consecutive starts for the first time this season

Athletics: RHP Aaron Brooks (1-0) pitches in the opener of a four-game series against Houston on Friday. Brooks picked up his first career win in his previous start after being called up from the minors.