BOSTON • Framber Valdez lost his perfect game and then bounced the following pitch off the next batter’s leg.

Astros manager Dusty Baker decided it was time for a chat.

“That’s the time when you’ve really got to settle him down,” Baker said. “I said ‘Hey, you’re the best. Just be natural and do your thing.’ I didn’t say a whole bunch to him.”

It was enough to get Valdez through the inning — and more.

Perfect through four, the Houston left-hander took a two-hit shutout into the seventh and became the first pitcher this postseason to complete eight innings, leading the Astros over Boston 9-1 on Wednesday for a 3-2 lead in the AL Championship Series.

Yordan Álvarez had three hits and three RBIs for Houston, which needs could clinch a second straight trip to the World Series with a victory at home on Friday night.

The Red Sox need a win to force a deciding seventh game on Saturday.

“We came back to Boston exactly where we wanted to be: We were 1-1,” Red Sox starter Chris Sale said. “Not in a good spot going back to Houston. There’s no denying that, but this team has won two games in the playoffs back-to-back before, and we think we can do it again.”

One day after the Astros scored seven runs to break a ninth-inning tie, they hung another crooked number on the Fenway Park scoreboard, chasing Sale while scoring five runs in the sixth. Álvarez, who homered in the second and singled in the fourth, had a two-run double to break things open.

That was plenty for Valdez, who extended the staff’s shutout streak to 14 straight innings before Rafael Devers homered with one out in the seventh — one of just three hits for Boston. The left-hander departed after retiring the Red Sox in order in the eighth.

“If a guy’s dealing, you just let him keep dealing,” Baker said. “Today, it was in the hands of Framber. Everybody talks about momentum, but momentum is controlled by the pitcher. If the pitcher’s dealing, all that momentum’s gone.”

In all, Valdez gave up one run on three hits, one walk and a hit batter, striking out five. He was also the first opposing pitcher to last eight innings in a postseason start at Fenway since Cleveland’s Charles Nagy went eight in the 1998 Division Series.

Ryne Stanek pitched a perfect ninth while the rest of Houston’s relievers rested. Astros starters had not lasted three innings all series, pitching to a 18.90 ERA in the first four games and giving up 10 homers — including a record three grand slams.

Valdez was not much better, allowing two earned runs in 2 2/3 innings in Game 1.

“I didn’t get frustrated at all. I wasn’t down on myself,” Valdez said. “What I did was I decided I’m going to work really hard so that when I come out here for the next outing, I’m going to be as 100% ready as I can be, to demonstrate to my team what I’m capable of, to demonstrate to my team that I can come out here and compete with any team in the league.

“So I just worked the entire time and I had my mindset set that I was just going to come out and have a way better outing,” he said. “And that’s what I was able to do tonight.”

Valdez retired the first 12 batters on Wednesday — eight on grounders, four on strikeouts. Devers singled to lead off the fifth, then Valdez bounced the next pitch off J.D. Martinez’s leg. The Astros escaped when Hunter Renfroe grounded into a double play and Alex Verdugo bounced out to first.

Sale was charged with four runs — two earned — on three hits and two walks, striking out seven in 5 1/3 innings.

“I was good for five, and then I sucked for one,” he said. “I told myself coming into this game I had a job to do; obviously didn’t get it done. But I left (it all) out there on that mound tonight, that’s for damn sure.”