A struggling Cubs offense received a much-needed jolt from Ian Happ on Thursday.

Happ hit a pair of 3-run home runs — one from each side of the plate — in consecutive innings, sparking an 8-run outburst over the 4th and 5th innings as the Cubs beat the Phillies 10-2 in the series finale.

He became the first Cub since Víctor Caratini on July 3, 2019, to homer from both sides of the plate.

“Ian had some huge swings,” manager Craig Counsell said. “We got men on base in front of him for those swings. Two 3-run homers puts a smile on everybody face, for sure.”

For a day, at least, it eases the pressure on a scuffling Cubs offense.

Thursday was just the third time all season that the Cubs had scored double digits in a game. Last season, the Cubs scored 10 or more runs 24 different times.

Part of the Cubs’ issues this season have stemmed from an offense that hasn’t produced at the levels that it did in 2023.

“It’s huge,” Happ said after the game. “We’ve been looking for one of these for a while now, where we can kind of go out there [and] everybody contributes and makes it easy on the bullpen. Let’s ride that momentum and see what we can do.”

In the 4th, against the Phillies’ Christopher Sánchez, the Cubs offense began to build some momentum. Cody Bellinger led the frame off with a walk against the lefty and Seiya Suzuki followed with a single to right field.

Sánchez, who entered Thursday with the second-best ERA in the National League, threw him a 3-1 sinker that was almost middle-middle, which Happ deposited into the left field bleachers. It was the start of a 5-run frame where the Cubs sent 9 hitters to the plate and saw them turn a 2-run deficit into a 3-run advantage.

“He’s been excellent, excellent for them,” Counsell said. “We put pressure on them in the 2nd and then we finally cracked through. But we did a good job just putting pressure on him.”

An inning later, the Cubs started the frame similarly.

Bellinger singled and Suzuki had an infield hit, forcing the Phillies to turn to their bullpen. Philadelphia manager Rob Thompson turned to righty Seranthony Domínguez to turn around Happ and be set up against a right-handed heavy lineup.

Happ followed with his second homer of the day — this one on a slider that was inside to break the game open.

“I haven’t faced him a ton,” Happ said. “He obviously closed for them for years and maybe one or two at-bats against him. Just going in there, trying to see what he’s gonna go to with runners in scoring position.

“He threw me two good sliders that I had a chance to hit but kind of fouled off, so to be able to get one, turn around on it and make a really good swing, felt really good.”

It was Happ’s second time homering from both sides of the plate — the first was on May 7, 2018, against the Marlins. He’s the 7th Cubs switch-hitter to hit a homer run from both sides of the plate.

“To do that, to get an opportunity to do it in a game, it’s pretty special,” Happ said of the homers from each side of the plate. “You don’t think about it in the moment but after reflecting a little bit, that’s a cool one for me.”

He’s the first Cub since Aramis Ramírez in 2010 to hit two 3-run homers in the same game.

His 6-RBI are a career-high, too. Happ finished 4-for-4 — he singled in the 2nd inning and doubled in the 7th, finishing a triple shy of the cycle.