How Andrew Painter is learning to get ahead with the big league ball originally appeared on NBC Sports Philadelphia
Andrew Painter learned something last year that does not show up in a box score.
The baseball itself can change your whole season.
“The ball is different,” he said.
That is key to understanding part of what happened to Painter in 2025 — and everything the Phillies are expecting from him when he makes his Major League debut Tuesday night against the Nationals.
He is 22, the club’s top-ranked pitching prospect, and after years of anticipation, hype, injury and rehab, the more interesting part of his story is not the date on the calendar.
It is what he figured out in the year leading up to it.
“The minor league balls usually have a little higher seam, and the spin is usually a little higher,” Painter said. “So with fastballs, that’s why in the Minors you’ll sometimes see some of these weird ones with great vertical break, whereas you won’t really see that with the big league ball.”
That doesn’t mean one ball is better and one is worse. It means they reward different things. Painter says fastballs and breaking balls tend to play better with the minor league ball. Something like a splitter can benefit from the big league ball because you are trying to kill spin.
The difference is real, especially for a pitcher trying to recapture a feel he had before a torn UCL took two years away from him.
In 2022, Painter was one of the most dominant arms in the minor leagues. He opened that season at Clearwater and ended the year at Double-A Reading. He posted a 1.56 ERA and a 0.89 WHIP across three levels of the system.
The 19-year-old Painter steamrolled through the lower levels of the minors with a minor league ball.
When he returned to action at Triple-A last season — his first full year back from Tommy John surgery, and his first full season throwing the Major League ball against advanced competition — he ran into something he had never encountered before.
Painter was not just returning from one of the worst injuries a pitcher can endure. He was attempting to regain feel for a fastball with a different baseball in his hand, against better competition, while building himself back physically.
The result was a season where he allowed 119 hits in 106 2/3 innings, gave up 18 home runs and saw his WHIP jump to 1.55, fourth-highest in the International League. His ERA landed at 5.40.
And he didn’t fully realize why his command was not as sharp in the moment.
“Looking back, especially when I’m trying to chase what the fastball was pre-TJ, all those fastballs — everything I was throwing before and through TJ — were with a Minor League ball,” Painter said. “So it’s kind of hard to compare. You’re comparing apples to oranges there.”
In 2025, Painter looked like two different pitchers at once.
Last year at Triple-A, Painter’s first-pitch strike rate was only 47.2 percent. If that number had qualified in the Majors (minimum 110 innings), it would have been the lowest at the big-league level since 2004.
Meanwhile, his zone percentage — the share of total pitches that actually crossed the strike zone — was a staggering 49.2. That would have led the Majors in 2025, ahead of Tarik Skubal’s 48.3. Over the last 10 seasons, only 10 pitchers have posted a higher single-season zone rate.
That combination does not usually happen. The pitchers who live in the zone tend to get ahead. Skubal led the majors in both categories last season. George Kirby did the same in 2023, and Miles Mikolas followed suit in 2024.
Painter lived in the zone while pitching from behind more than half of the time, and that begins to explain the problem.
Painter’s struggles began midseason at Triple-A. Lehigh Valley pitching coach Phil Cundari and Painter were working on expanding his repertoire during that time.
“Before last year, his arsenal didn’t include the changeup, and that came at the beginning of the year,” Cundari said. “Along the way, we also moved toward developing a sinker, a two-seamer, and the sweeper as well. So now you’re talking about three essentially new pitches being incorporated in the middle of a season.”
All with a different ball and different level of hitter.
Those additions even affected Painter’s fastball control, especially early in counts.
“I feel like last year I kind of got into a habit where some of those [first pitch] fastballs would just fly up and away, especially to lefties,” Painter said.
While Painter would commonly fight back into the zone, he predictably kept going back to the fastball — and got beat.
“It wasn’t that there weren’t as many strikes,” Cundari said. “There weren’t as many good strikes.”
“One of the biggest things is confidence in the zone,” Painter said. “You have to realize how much easier it is to pitch when you’re ahead in the count, and I think the results themselves kind of push you to say, ‘Alright, I need to get ahead of this guy.”
That is where the reset comes in.
Painter does not talk much about his heater, which reached 99 mph in Grapefruit League action, as the main solution. He likes to talk about his slider.
“That’s my best in-zone pitch,” he said. “It’s the pitch I throw for a strike at the highest clip. I think there were times last year where I’d fall behind, then I’d try to go back to [the fastball] and the miss would be consistent.
It’s realizing that cue and that feel for the hard slider kind of gets me back in the zone. It’s kind of swallowing your pride a little bit and not being afraid to flip something in there — whatever pitch you feel most confident throwing for a strike.”
Working closely with Phillies pitching coach Caleb Cotham and catcher J.T. Realmuto this spring, the adjustment showed up in the numbers. His first-pitch strike rate climbed nearly three percentage points. His zone rate stayed extremely high at 49.4. But it was his slider usage that jumped from 11.6 percent in 2025 to 29.5 percent this spring.
Once Painter gets strike one, everything opens up — he can change shapes and utilize his full five-pitch mix to put hitters away.
“What stood out on a start-by-start basis [last year] was that he wasn’t leaving the zone,” Cundari said of Painter. “The toughness and resilience he showed during that time were impressive … that speaks to the level of competitiveness he has.”
Having spent a full year throwing the big league ball and a spring camp behind him, Painter now possesses a more thorough understanding of his pitches, their purpose and what strike one unlocks.
The minor league education is done. The debut is on tap.