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Boston, MA (SportsNetwork.com) - The St. Louis Cardinals needed Michael Wacha to play stopper and the 22-year-old rookie needed help.

A sacrifice fly from Matt Carpenter, a couple of Red Sox errors and Carlos Beltran's first World Series RBI was enough.

The Cardinals trailed when Wacha came out after six innings but scored three runs in the seventh Thursday night to beat the Red Sox 4-2 in Game 2 of the World Series.

The best-of-seven series is tied 1-1 with Game 3 set for Saturday in St. Louis.

Wacha (1-0) got his fourth win in four postseason starts despite giving up a two-run homer to David Ortiz in the sixth inning that gave Boston a 2-1 lead.

In the seventh, Craig Breslow came in for John Lackey after the Boston starter gave up a one-out walk to David Freese and a single to Jon Jay. After a double steal, Daniel Descalso's walk loaded the bases.

Jonny Gomes' throw home on Carpenter's sac fly was wide to the first base side and got past Jarrod Saltalamacchia. Breslow, backing up his play, then threw high to third base trying to get Jay, who scored on the play's second error to give the Cardinals a 4-2 lead.

Carlos Martinez threw a 1-2-3 seventh inning and pitched out of a jam with runners at first and second in the eighth for St. Louis. Trevor Rosenthal struck out three in a perfect ninth to wrap up the win.