Orioles 6, Red Sox 5: Steve Pearce doubled in the tying and go-ahead runs in the eighth as host Baltimore evened the series with Boston.

Pearce added an RBI double in the second and Brian Roberts belted a solo homer for the Orioles, who won for the third time in the last 10 games. Kevin Gausman (3-5) pitched 1 1/3 scoreless innings of relief to earn the win and Jim Johnson worked a scoreless ninth for his 49th save.

The Red Sox battled back from a 4-2 deficit to grab the lead in the seventh but Junichi Tazawa (5-4) allowed the first two batters of the eighth to reach. Franklin Morales came on and struck out Nick Markakis before Pearce ripped a double into the corner in left to plate Nate McLouth and Danny Valencia.

Daniel Nava went 4-for-4 and Dustin Pedroia added three hits and an RBI for Boston, which clinched home-field advantage throughout the playoffs with Oakland’s loss earlier in the day.

Pedroia’s RBI single in the fifth knotted it at 2-2 before Baltimore went back on top with two runs in the bottom of the frame. David Ross doubled in a run in the sixth and Jonny Gomes drove in the tying run in the seventh before Pedroia scored on an error to make it 5-4.

GAME NOTEBOOK: Jon Lester started for the Red Sox and allowed four runs on nine hits in five innings to snap a string of nine straight quality starts while Baltimore starter Wei-Yin Chen was charged with three runs on nine hits in 5 1/3 frames. … Boston DH David Ortiz, CF Jacoby Ellsbury and C Jarrod Saltalamacchia all got the night off. … Four of Pearce’s last five hits have gone for extra bases.