After a rocky second half in New York, lefty David Peterson makes his Cubs debut Saturday in Wisconsin, joining a NL Central fight the team hopes can bring him back toward the All-Star form he showed last season.
MILWAUKEE — David Peterson was an All Star last season.
For months after the Midsummer Classic, though, the left-hander’s results unraveled—so much so that when the Cubs acquired him in a Thursday trade with the Mets, the move carried a simple hope: that a new environment can steady a pitcher who’s been searching for his footing.
Peterson posted a 3.06 ERA before the break last year, but followed with a 6.34 ERA in the second half. This season, he’s struggled again, landing at a 6.09 mark. Saturday will mark the first time in his decade-long pro career that he’s pitching for an organization other than the Mets.
He’ll be dropped straight into the NL Central fight with his Cubs debut in Wisconsin—another reminder that this isn’t just about one player’s comfort. It’s also about the Cubs’ need for stability on the mound.
Cubs manager Craig Counsell framed the trade as more than a roster change. Before Friday’s game, he pointed to the value of resets when things aren’t going well.
“There’s some aspect of this [being] a change of scenery,” Counsell said. “We all can acknowledge that sometimes a change of scenery is a good thing.”
“When things aren’t going well, sometimes a fresh start is something that can reenergize you, refocus you and hopefully get you to a good place. Hopefully, we can provide that.”
The timing of the deal mattered, too. The trade was a long-gestating move. but it came together with urgency after righties Edward Cabrera and Ben Brown hit the injured list earlier this week. With injuries thinning the staff. the Cubs don’t have the luxury of watching Peterson sink further—they need him to deliver.
One of the loudest arguments around the acquisition was defense up the middle. The Cubs took notice of Peterson’s ground-ball profile, with an infield stocked by Gold Glovers seen as a natural fit to help him avoid the kind of damage that can snowball when the ball ends up in play.
Watching Mets infielders commit one error after another during the Cubs’ four-game sweep in Queens gave that argument momentum. It also landed with particular weight for Peterson. who admitted that he wasn’t necessarily chasing the idea of a change while still in New York—but he understands how it can work.
“When I was there, my whole goal and focus was to help the Mets win games. But I do think there is something to [the change-of-scenery thing],” Peterson said. “I’ve seen it with other guys. I’ve seen it with friends in the game. where they’re stuck in a rut or stuck in a spot that they’re not necessarily enjoying. and they go somewhere else and have a lot of success.”.
“That’s part of what gets me excited about this opportunity [along] with also joining a great team. … It’s definitely a thing.”
“It wasn’t necessarily a thought of mine in New York of hoping for a change. I was committed to where I was at, just like I am now, committed to being here and helping these guys win.”
There’s pressure under the optimism. The Cubs acquired Peterson while also parting with a former second-round draft pick. meaning the trade can’t become a story of justification. It has to become a story of results—especially as the trade deadline gets closer and Jed Hoyer’s front office weighs how much more it can do to build a championship contender.
In the month-to-month reality of a season. the difference between a staff that steadies and one that wobbles can be stark. That’s why Peterson’s next six months are likely to be judged by the only thing that fully answers all the questions: whether his numbers improve from what he’s put up since the break.
He didn’t offer a complicated roadmap. He talked about daily work, about cleaning up issues early in the year, and about trying to feel like himself again.
“You’re always trying to get better every day,” Peterson said. “I went through some things early in the year that we needed to clean up and feel a lot better about where we’re at now, feel like myself back in ‘24, ‘25.”
“It’s baseball. You’re going to go through waves. You’re trying to get better every single day and continue to hammer the good feels and mechanics and continue to do your homework and scouting on the guys you’re going to face.”
“My goal is to be prepared every five days when I take the ball and give this team a chance to win.”
For now, that chance arrives Saturday in Wisconsin—an All-Star baseline from last season, a rocky stretch afterward, and a Cubs organization betting that a new logo, a new infield, and a new day at the mound can pull Peterson back toward his best form just in time to matter.
David Peterson Chicago Cubs New York Mets Craig Counsell NL Central MLB trade injuries Edward Cabrera injuries Ben Brown