Pete Crow-Armstrong’s meteoric rise as a hitter almost seems like it happened overnight.

On April 12, when the Cubs played Game 2 of a three-game series against the Los Angeles Dodgers, Crow-Armstrong was slashing just .197/.264/.258 (.522 OPS) on the season.

The next day, he broke out for two home runs to help the Cubs beat the Dodgers 4-2, securing a statement road series win — and Crow-Armstrong hasn’t looked back since then.

In his last 15 games, he is hitting .345 with six home runs, 16 RBI and a 1.149 OPS. Those numbers have skyrocketed Crow-Armstrong up leaderboards to make him one of the most valuable players in MLB.

He was already an elite defender and baserunner, and now Crow-Armstrong is adding strong offensive production to the mix.

What has Crow-Armstrong done to become such a dangerous hitter? According to Cubs hitting coach Dustin Kelly, it’s been small tweaks that he began working on in the spring.

[MORE: The key behind Pete Crow-Armstrong’s historic start with Cubs]

“(His stance) is a little more stacked on the backside, and the leg kick’s a little bit lower,” Kelly told Marquee Sports Network’s Elise Menaker when the team was in Pittsburgh. “The bat is staying really flat through the zone and off his shoulder.”

Kelly said Crow-Armstrong has also been able to make similar adjustments throughout an at-bat, allowing him to settle in and wait for his pitch to hit.

“That’s what we’ve noticed so much through this stretch,” Kelly continued. “He’s just putting together four or five good at-bats in a row.”

Those adjustments have allowed Crow-Armstrong to hit pitches he rarely used to — and he’s hitting them harder than ever before.

“He went from being a league-average hitter in the zone to a well-above-average hitter now,” said Lance Brozdowski on the “Cubs Daily Podcast.”

Brozdowski noted that Crow-Armstrong is slugging pitches in the heart of the zone far more than last season.

“That’s a huge part of his game — being able to do damage on those pitches,” Brozdowski said. “If you want to be a productive major league hitter, you have to do damage over the middle of the plate.”

Crow-Armstrong’s barrel rate — a metric that measures the combination of lofting the ball and driving it hard enough to create damage – is up to 12.1% from 7.4% last season.

And Crow-Armstrong isn’t just barreling the ball in the zone — he’s also one of the best in MLB at crushing pitches outside of it.

Brozdowski found that Crow-Armstrong is tied for most barrels outside of the zone in MLB (4), a number equaled by New York Mets slugger Pete Alonso. Crow-Armstrong displayed that sheer power off Dodgers pitcher Noah Davis on April 23, golfing a sinker well below the zone for a three-run, opposite-field home run.

“He’s crushing the ball, and it’s impressive that he’s hitting these balls down,” Brozdowski said. “It’s been a really impressive season for Pete overall.”

Kelly said he felt Crow-Armstrong’s hard work is now paying dividends at the plate.

“It’s confidence and experience,” Kelly said. “He’s just locked in.”