BOSTON -- Kyle Schwarber smacked the Red Sox's third grand slam in the past two games as Boston powered to a 12-3 rout of Houston Astros in Game 3 of the American League Championship Series on Monday night.

The Red Sox finished the night with four homers while taking a 2-1 lead in the best-of-seven series.

Schwarber's second-inning slam into the right field bleachers off Astros starter Jose Urquidy (0-1) capped a six-run inning and sent the Fenway Park faithful into a frenzy.

Boston became the first team with three grand slams in the same postseason series. J.D. Martinez and Rafael Devers each hit one in the Red Sox's 9-5 win at Houston in Game 2 on Saturday.

Christian Arroyo (three RBIs) and Martinez (2-for-3) each had two-run homers on Monday, Devers added a solo blast and Christian Vazquez (2-for-4) had a pair of RBIs for the Red Sox.

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Boston starter Eduardo Rodriguez (1-0) allowed three runs on five hits and no walks while striking out seven over six innings.

Game 3 winners when the ALCS was tied at one game apiece have gone on to win the series 78 percent (18 of 23) of the time. Game 4 is Tuesday night in Boston.

Kyle Tucker hit a three-run homer to account for the only Houston offense.

Urquidy gave up six runs (five earned) on five hits while walking two and striking out one in 1 2/3 innings. It was his first appearance this postseason for the Astros, whose three starters have a combined 20.25 ERA during the series.

Vazquez's bases-loaded single plated Boston's first run with one out in the second before Arroyo reached on a fielding error by Astros second baseman Jose Altuve. One run scored on the miscue, and the bases remained loaded for leadoff hitter Schwarber, who socked a 3-0 pitch.

Hunter Renfroe walked with one out in the Boston third and advanced to third after his steal of second coaxed a Martin Maldonado throw into center. Vazquez singled him home the next at-bat before Arroyo belted a pitch into the Green Monster seats in left.

Tucker's third postseason home run of the year, in the fourth off Rodriguez, cut Houston's deficit to 9-3. Martinez got two runs back for Boston on his third playoff homer in the sixth, and Devers belted his fourth long ball of the postseason in the eighth.