David Peterson entered 2026 as the longest tenured New York Met. Over the course of the offseason leading up to the 2026 season, so many of Peterson’s former compatriots either were dealt away or signed elsewhere. Thus, David Peterson was the last man standing who went back to the prior ownership group. Peterson was looking to get back on track after a dismal second half of 2025, which came immediately after an All-Star first half of 2025. And with free agency looming at the end of the season, it was imperative
that Peterson play well enough to be able to get a nice payday in his first chance at the open market.
Unfortunately for David Peterson and for the New York Mets, he wasn’t able to recapture any past glory, instead falling further from his top form of 2024 and the first half of 2025. His first start was 5.1 innings of scoreless baseball against the Pittsburgh Pirates, and after that everything went downhill. In 16 games with the Mets in 2026 (half of those starts), he had a 6.09 ERA in 68 innings, striking out 63 while walking 30 batters. He had a 1.647 WHIP, with a 10.9 H9 and a 67 ERA+, all career worsts. He was worth -1.0 bWAR, which was also a career worst and was an incredible freefall from the two seasons before.
The Mets didn’t lack for wanting or trying to fix Peterson. They moved him to and from the bullpen, trying to find a role that would suit him and the changes to make that could fix him. And as the team went deeper and deeper into their own free-fall, it felt more and more imperative to find a way to plug as many of the holes as possible, whether that was by fix or by removing.
For Peterson, it ended up being the latter. On June 25th, Peterson was traded to the Chicago Cubs in exchange for minor league first baseman Cole Mathis. Thus went the longest tenured Met, and started what would become a major sell-off for the Mets ahead of the trade deadline. With the Cubs, Peterson was able to recover a little bit, appearing in 16 games with Chicago (15 of them starts) with a 3.70 ERA with a 1.369 WHIP and a 114 ERA+, and rebounding with 0.9 bWAR which brought him back up to just -0.1 bWAR over the course of the whole season.
After just over six seasons with the Mets, Peterson ended with a New York career 4.31 ERA, 677 strikeouts, a 94 ERA+ and 5.9 bWAR. Beyond that, he collected several accolades and big moments with the Mets. He was both an All-Star and Gold Glove finalist in 2025. He was a big part of the Mets 2024 playoff and postseason run, recording a save in Game 3 of the Wild Card series to send the Mets to the NLDS and got a win in Game 4 of the NLDS against the Phillies. He was the first lefty to throw a complete game shutout with the Mets since Steven Matz, throwing one against the Nationals in June 2025. Even with the inconsistencies and the disappointments, there were also some triumphant moments in Peterson’s time with the Mets.
Now, after a somewhat bounceback second half with the Cubs, Peterson enters free agency for the first time in his career. It will be a crazed free agency with most of it probably happening before the inevitable lockout amid CBA negotiations in December. Peterson might end up getting less money or less suitors because of it, and a potential reunion with the Mets seems highly unlikely. So, unfortunately for David Peterson and the Mets, the final memories of David Peterson in a Mets uniform will be marred with the frustration and misery of a failure of a Mets season where David Peterson was one of many not-insignificant problems that plagued the Mets.
