WEST SACRAMENTO, Calif. (Interstat) — Andruw Monasterio hit a two-run homer in the top of the 10th inning, lifting the Boston Red Sox to a 4-2 victory over the Athletics on Wednesday night at Sutter Health Park.

The Red Sox won for the second time in the three-game series, improving to 56-51. The Athletics fell to 45-63.

Monasterio’s blast, his sixth of the season, came with Romy Gonzalez on second base as the automatic runner under the extra-inning rule. The shortstop finished 3 for 4 with two RBIs and scored twice. His decisive swing erased a 2-2 deadlock that had persisted since the sixth inning.

Boston tied the game at 2 in the top of the sixth on a run-scoring single by Nick Sogard that brought home Caleb Durbin. Durbin had led off with a single, advanced to second on a flyout and scored on Sogard’s line drive to center.

The Athletics responded with a solo homer from Lawrence Butler in the bottom of the fifth to take a 2-1 lead, but Boston had already drawn even in the top of the inning on a leadoff homer by Jahmai Jones. Jones walked in the first inning and later scored on a walk, but his solo shot—his fourth of the season—tied the game at 1.

Jonah Heim put the Athletics ahead in the second inning with a solo homer to center, his 11th of the year. The Athletics added a run in the fifth on Butler’s homer, but Boston’s bullpen held them scoreless over the final five innings.

Patrick Sandoval started for Boston and pitched five innings, allowing two runs on five hits while striking out seven. He gave up both Athletics homers but left with the game tied. Tyron Guerrero, Garrett Whitlock and Greg Weissert combined for four scoreless innings of relief. Weissert earned his first save of the season, working a perfect 10th inning with two strikeouts. Aroldis Chapman got the win, pitching the ninth inning despite allowing a double to Lawrence Butler. Chapman stranded Butler at third by striking out Jacob Wilson and Jeff McNeil to force extras.

José Suarez took the loss for the Athletics. He entered in the 10th and surrendered Monasterio’s homer. Suarez fell to 1-3.

Boston had 12 hits to eight for the Athletics. The Red Sox left 10 runners on base and struck out 13 times. The Athletics stranded eight runners and struck out 14.

Jahmai Jones went 1 for 2 with a homer and a walk. Caleb Durbin collected three singles in five at-bats, scoring twice. Sogard had two hits, including the RBI single. Willson Contreras walked twice and singled once in four plate appearances.

For the Athletics, Heim had two hits, including the homer. Butler homered and doubled. Jeff McNeil singled twice. Jacob Wilson reached base twice with a single and an error.

The game featured several tense moments. In the bottom of the ninth, Butler led off with a double off Chapman. A sacrifice bunt moved him to third with one out, but Chapman struck out Wilson and McNeil swinging to escape.

Boston threatened in the top of the ninth against Athletics reliever Hayden Juenger. Contreras singled and Durbin lined a single to left, putting runners at first and second with one out. But Romy Gonzalez grounded out to second, ending the inning.

The Red Sox had a similar opportunity in the seventh. Ceddanne Rafaela doubled, moved to third on a groundout, and then Contreras and Durbin walked to load the bases with two outs. But Gonzalez again grounded out to first.

Athletics starter Jake Miller lasted four innings, allowing four hits and two walks while striking out six. Juenger pitched three scoreless innings of relief before Suarez entered.

Attendance was 9,674. The game took 3 hours, 16 minutes.

The Red Sox won the series after splitting the first two games. Boston lost Tuesday night 4-3 before winning Monday 4-2. The teams conclude the four-game set Thursday.

Boston heads to Los Angeles for a three-game weekend series against the Dodgers beginning Friday. The Athletics return home for a three-game set against the Detroit Tigers starting Friday.

Interstat’s game simulator projected a final score of Boston 8, Athletics 3. Interstat’s ELO system gave Boston a 63.10 percent probability to win. Boston was installed as a pregame favorite with a spread of minus-1.5. The total of six runs went under the over-under line of 10.