Photo: Scott Strazzante / The Chronicle Photo: Ben Margot / Associated Press Photo: Scott Strazzante / The Chronicle Photo: Jayne Kamin-Oncea, Getty Images Photo: Hunter Martin / Getty Images Photo: Matt Slocum / Associated Press Photo: Hunter Martin / Getty Images Photo: Matt Slocum / Associated Press Photo: Hunter Martin / Getty Images Photo: Hunter Martin / Getty Images Photo: Hunter Martin / Getty Images

PHILADELPHIA — This is one Philadelphia story that Katharine Hepburn and Cary Grant could not have saved.

This visit to Citizens Bank Park has been a disaster flick for the Giants, who spent three games in Atlanta decimating the Braves only to get a gallon of their own medicine here.

Philadelphia crushed the Giants 11-3 Wednesday night and has outscored them 26-5 in the first three games of a series with Thursday’s matinee remaining, which can be viewed only with a Facebook account.

Their pitching aside — Chris Stratton allowed five runs in 42/3 innings and Pierce Johnson surrendered six in relief — the Giants have gone stone cold at the plate after they scored 24 runs over three games in Atlanta.

“You have to give them credit,” manager Bruce Bochy said, referring to Phillies starters Zach Eflin, Aaron Nola and Nick Pivetta. “They pitched well and we didn’t quite pitch as well. When you don’t get hits with runners in scoring position, you look flat. We need to get somebody to do something to provide energy in the dugout.”

Bochy made a change, hoping to goose the offense. He had Brandon Belt start in left field and Pablo Sandoval at first base to get both in the lineup together.

“It’s something I’ve been thinking about doing,” Bochy said. “Things have been going well the last couple of weeks, but when you have a couple games like we’ve had, this does give you two pretty good left-handed bats in the lineup. I think you’ll see more of it.”

The move also underscores an odd imbalance in the pitching the Giants have faced and the roster flaw it has exposed.

For reasons that are hard to pinpoint, the National League West is flooded with left-handed starting pitchers. In their first 31 games, mostly within the division, the Giants faced 18.

The East is stuffed with right-handed starters, and the Giants are seeing nothing but righties on this 10-game trip.

The main problem lies in the outfield. With Mac Williamson and Hunter Pence hurt, Gregor Blanco has become the regular left fielder, leaving right-handed hitters Gorkys Hernandez and Austin Jackson to share center.

That is not what the Giants employed them to do. Blanco and Hernandez were supposed to be the fourth and fifth outfielders. The Giants signed Jackson to move around the outfield, face left-handed pitching and perhaps platoon with Steven Duggar when the Giants thought their center-field prospect was ready.

Jackson has had to start against many of the righties the Giants have faced, and his numbers reflect it. He entered Wednesday night’s game batting .224 with a team-leading 35 strikeouts in 85 at-bats, which would be easier to accept if he were playing well in center. But he’s not.

Hernandez, who started against Pivetta, had a .298 average but still was hitting 54 points lower against right-handers.

None of this was an issue in Atlanta, where the Giants pounced on right-handers Mike Foltynewicz, Brandon McCarthy and Mike Soroka in a sweep. It has been in Philadelphia.

The problem would ease if Williamson returned from his concussion soon. He could play left field every day and give Bochy the option of choosing among Hernandez, Jackson and Blanco to play center based on matchups.

Another potential solution that lies in the minors is unlikely to occur.

The Giants could promote Duggar, giving them a left-handed bat and a much better center fielder. But they are reluctant to add him to the 40-man roster, requiring another player to be cut, and disrupt Duggar’s development only to send him back to Sacramento when Williamson returns.

“There are things we are having him work on, and we don’t want to disrupt that, change direction and then send him back down after 10 days,” general manager Bobby Evans said.

Duggar has cooled off, too, including a recent eight games in which he was 5-for-27 with 13 strikeouts.

Henry Schulman is a San Francisco Chronicle staff writer. Email: hschulman@sfchronicle.com Twitter: @hankschulman