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“That was a lot of fun,” Wacha said of his hit. “I told myself that I was going to hop on the first heater. I was able to sneak it by the shortstop up the middle. I was pretty fired up about that.”

Wacha also helped set up a three-run second with a sacrifice bunt that pushed Pete Kozma to third in front of consecutive doubles from Matt Carpenter and Jon Jay.

Jay scored on Morton’s final offering, a wild pitch that bounced just in front of the left-handed batter’s box.

The Cardinals jumped in front with two runs in the first. Carpenter and Jay singled to start the inning and Matt Holliday walked to load the bases. Carlos Beltran hit a sacrifice fly and Yadier Molina had an RBI grounder.

“We all knew what was at stake,” Carpenter said. “This is the last time we get to play these guys, so it was a big series. I couldn’t be happier with the way it played out. Not just the fact that we won all three, but the fashion that we won all three. Really dominated, I feel like, every aspect of the game.”

Pittsburgh scored twice in the ninth off reliever Sam Freeman. Garrett Jones hit an RBI double and Gaby Sanchez had a sacrifice fly.

Jones said Wacha had the Pirates guessing all day.

“He has deception,” he said. “That downward angle can be tricky. He was able to hit his spots and he has a good arm.”

NOTES: Pirates CF Andrew McCutchen singled in the seventh to extend his hit streak to seven games. … Carpenter’s single in the first was his 99th hit at home this season, a single-season record for the current Busch Stadium. … Pittsburgh 3B Pedro Alvarez committed his major league-leading 27th error in the seventh, allowing pinch-hitter Brock Peterson to reach. … The Cardinals are off Monday, but many will participate in Matheny’s charity golf tournament. His Catch 22 Foundation supports charities that work with children with disabilities.