Showalter said the Orioles were the beneficiary of some friendly ball-strike calls from home plate umpire C.B. Bucknor early in the game.

“We were fortunate we had a lot of borderline pitches with Gaudin go our way,” Showalter said. “That could have not even had those situations. But you still want to cash in on them over the course of a game. … We got the game in some situations where we liked our chances. We just weren't able to get it done [Saturday] compared to [Friday] night.”

Chen also said he struggled with Bucknor's strike zone.

“It was a little hard for me to adjust to the umpire's strike zone,” Chen said. “The first five innings I felt like I could keep the ball down but the sixth inning I felt like everything was up. So it was a little hard for me.”

Davis opened the eighth inning with a mammoth solo blast to center field, taking a 1-0 pitch from right-hander Santiago Casilla about 15 rows deep into the outfield bleachers for his majors-leading 109th RBI of the season. The shot was calculated to be 466 feet, according to ESPN Stats and Information, which is the longest measured homer of his major league career.

Markakis and Hardy then followed with back-to-back one-out singles, but Casilla struck out Flaherty looking and pinch hitter Matt Wieters swung through a breaking ball to end the inning.

“Not quite enough,” Davis said of his homer. “Chen pitched a really good game. … I thought we put some good swings on some pitches. It plays big but you've got to be able to put runs across the board other than hitting balls out of the ballpark.”

The Orioles had the tying run at first with no outs in the ninth against Giants closer Sergio Romo after pinch hitter Henry Urrutia slapped a leadoff single to left. But Romo retired the final three Orioles batters of the game, closing out the game by getting Davis on a ground out to second.

“I think any time you have runners on, especially with our lineup, you expect somebody to come through with a big hit,” Davis said. “Their pitchers made pitches and they made plays and that's the way this series has gone so far. Every little run has been hard earned and they've been few and far between.”