Peterson has been demoted to the Mets' bullpen, Anthony DiComo of MLB.com reports.
Peterson has had a disastrous couple months while splitting his time between starting pitcher and bulk reliever, holding a 5.57 ERA, 1.67 WHIP and 53:23 K:BB over 53.1 innings. He will be available to pitch in relief beginning Sunday. Sean Manaea is taking Peterson's spot as a starter/bulk reliever.
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Mets' David Peterson: Implodes against Cincinnati
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Peterson (3-5) took the loss against the Reds on Tuesday, allowing six runs on 11 hits and three walks while striking out four across five innings.
Peterson put the Mets in a hole early after yielding an RBI double to Eugenio Suarez in the first inning before giving up another three runs in the fourth. It could have been a worse stat line for Peterson, given that he gave up at least two baserunners in four of the six innings in which he pitched. The 11 hits allowed were a season high, and the six earned runs were his most in a start since April 29 against the Nationals (seven). Peterson now sits at a 5.57 ERA and 1.67 WHIP over 53.1 innings this season, and the 66 hits he's given up are tied for fifth most in the National League. His next start is lined up for next week on the road against the Mariners.
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Mets' David Peterson: Survives early scare in third win
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Peterson (3-4) notched the win Thursday against the Nationals, allowing one run on four hits and three walks in five innings. He struck out three.
Peterson weathered an early storm Thursday, stranding the bases loaded during the opening frame, and it was mostly smooth sailing thereafter. The 30-year-old southpaw has been erratic overall for the Mets this season, giving up at least four runs on four occasions, but he's yielded two or fewer runs in four consecutive outings during the month of May. Peterson will try to further improve on his 5.03 ERA, 1.55 WHIP and 49:20 K:BB over 48.1 innings in his next scheduled appearance against the Reds.
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Mets' David Peterson: Secures win in bulk-relief outing
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Peterson (2-4) allowed two runs on six hits, three walks and a hit batsman while striking out eight over four innings to earn the win Saturday versus the Yankees.
This was Peterson's third consecutive bulk-relief appearance, a span that has seen him earn his first two wins of the season. In his three outings in May, he's allowed seven runs (four earned) with a 17:3 K:BB over 13 innings. Overall, he has a 5.40 ERA, 1.57 WHIP and 46:17 K:BB through 43.1 innings. Peterson's looked more effective working behind an opener, so that trend could continue for his next projected outing, which lines up to be on the road against the Nationals.
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Mets' David Peterson: Slated for bulk role Sunday
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Peterson will operate in a bulk-relief role in Sunday's game against the Diamondbacks, Laura Albanese of Newsday reports.
As was the case in the Mets' 4-2 win over the Rockies this past Monday, Huascar Brazoban will serve as the team's opener. Peterson took the mound after Brazoban and Austin Warren in Monday's contest and ended up picking up the win after allowing two runs on three hits and no walks while striking out six across four frames. Peterson has yielded two earned runs or fewer in three of his last four outings but still sits at a 6.29 ERA and 1.60 WHIP across 34.1 innings this season.
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Mets' David Peterson: Captures first win in bulk role
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Peterson (1-4) earned the win Monday against the Rockies. He allowed two runs on three hits and no walks while striking out six over four innings.
Peterson, working behind Huascar Brazoban and Austin Warren, turned in a respectable effort in bulk relief, good enough to earn his first win of the season. The southpaw held the opposition scoreless through his first three innings before allowing a pair of runs in the seventh inning, underscoring his struggles to work deep into games and navigate a lineup multiple times. Across 34.1 innings in 2026, Peterson owns a 6.29 ERA and 1.60 WHIP with a 35:14 K:BB. The 30-year-old will look to stay in the win column in his next outing, tentatively scheduled for Sunday against the Diamondbacks, though it remains to be seen if he works behind an opener again.
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Mets' David Peterson: Set to operate in bulk role
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Peterson will pitch in bulk relief behind an opener in Monday's series opener against the Rockies in Colorado, Anthony DiComo of MLB.com reports.
Peterson will follow an opener for the second time this season after last doing so April 19 against the Cubs, when he tossed 3.2 scoreless innings while allowing three hits in the team's 2-1 loss to Chicago. The southpaw has posted a disappointing 6.53 ERA and 1.71 WHIP with 29 strikeouts over 30.1 innings in seven appearances (five starts) with New York this season.
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Mets' David Peterson: Losing ways continue
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Peterson (0-4) took the loss Wednesday against the Nationals, allowing seven runs on five hits and three walks in 3.2 innings. He struck out five.
Peterson entered in long relief in his prior two outings, but he didn't fare well in his return to the rotation. The left-hander coughed up a season-worst seven runs Wednesday, walking multiple batters for the fifth time in as many starts on the year. Peterson has a ghastly 6.53 ERA, 1.71 WHIP and 29:14 K:BB over 30.1 innings, so he'll be tough to trust in fantasy lineups during his next scheduled outing in Colorado.
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Mets' David Peterson: Starting Wednesday
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Peterson will start Wednesday's game against the Nationals, Andrew Tredinnick of The Bergen Record reports.
The left-hander worked out of the bullpen in his past two appearances -- including one in bulk relief -- but will return to the rotation Wednesday after allowing just one run across seven innings as a reliever. It's been an up-and-down campaign for Peterson, who fired 5.1 scoreless frames in his season debut but followed up with an 8.79 ERA in his next three starts.
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Mets' David Peterson: Working in bullpen this week
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Mets manager Carlos Mendoza said Tuesday that Peterson will have his turn in the rotation skipped this week and will work out of the bullpen, SNY.tv reports.
While starting in each of his first four appearances of the season, Peterson struggled to a 6.41 ERA and 1.83 WHIP, but he delivered better results while working in bulk relief behind opener Tobias Myers in Sunday's loss to the Cubs, tossing 3.2 scoreless innings. Despite the strong showing out of the bullpen, Peterson's grasp on a full-time spot in the rotation still appears to be tenuous, and the Mets will skip his turn this week and instead call up Christian Scott from Triple-A Syracuse to serve as their fifth starter Thursday versus the Twins. The Mets haven't revealed their plans for the rotation beyond this week, but if Scott performs well in his 2026 big-league debut, it's possible that he sticks as a starter over Peterson moving forward.
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Mets' David Peterson: Struggles in defeat
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Peterson (0-1) took the loss against San Francisco on Thursday, allowing six runs (five earned) on nine hits and two walks while striking out five batters over 4.1 innings.
The Mets gave Peterson a 1-0 lead in the top of the first inning, but he quickly gave that back plus more, as the Giants responded with three runs in the bottom half of the frame. Things didn't get any better for Peterson from there -- he yielded two more runs in the third and was charged with one more following his departure in the fifth. Peterson did manage to fan five batters, but his overall line was pretty destructive for fantasy managers who deployed him. This was certainly a letdown for Peterson after he shut out Pittsburgh across 5.1 innings during his season debut March 28.
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Mets' David Peterson: Three clean frames Wednesday
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Peterson gave up one hit and two walks over three scoreless innings during Wednesday's exhibition game against Team Israel. He struck out four.
The Israeli WBC lineup doesn't have any big MLB names in it, and Peterson had little trouble navigating his three frames on 48 pitches (28 strikes). The southpaw is locked into a rotation spot for the Mets after throwing a career-high 168.2 innings in 2025, but his 4.22 ERA and 1.37 WHIP were significant downgrades from his 2024 numbers.
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Mets' David Peterson: Avoids arbitration with Mets
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The Mets and Peterson avoided arbitration by agreeing to a one-year, $8.1 million contract Thursday, Joel Sherman of the New York Post reports.
It's a nice bump in pay for Peterson, who had been eligible for arbitration for the final time. The lefty faded down the stretch for the Mets in 2025 but still finished with a solid 4.22 ERA and 150:65 K:BB over 168.2 innings covering 30 starts.
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Mets' David Peterson: Hit hard against Cubs
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Peterson allowed five runs on five hits and two walks while striking out one batter in 1.1 innings Tuesday against the Cubs. He did not factor into the decision.
Peterson continued his stretch of horrendous starts in Tuesday's outing. In nine starts dating back to Aug. 6, Peterson has allowed at least four runs in six of them and has an 8.42 ERA and 1.78 WHIP over that span. The Cubs strung together a pair of runs in the first and another three in the second, forcing a quick hook for Peterson after he threw just 42 pitches (22 strikes). Manager Carlos Mendoza mentioned afterward that Peterson could play a big role for the remaining five games of the regular season, potentially pitching out of the bullpen. As of now, Peterson is lined up to start Sunday against the Nationals, though that would change if he's used in relief in advance of that game.
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Mets' David Peterson: Falls to San Diego
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Peterson (9-6) took the loss Wednesday against the Padres, surrendering six runs on six hits and three walks while striking out one over five innings.
The left-hander kept things close early but imploded in the fifth, when he issued two walks and allowed a bunt single to load the bases before Manny Machado cleared them with a grand slam. Peterson has struggled mightily since the beginning of August, posting a 6.99 ERA across nine outings (46.1 innings) and recording only two quality starts during that stretch. The 30-year-old is slated to face the Cubs in his next outing.
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Mets' David Peterson: Shuts down Nats
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Peterson (8-5) picked up the win Tuesday against Washington, allowing one run on four hits and one walk across eight innings. He struck out 10.
Peterson rebounded from his worst start of the season, as he allowed six runs and issued five walks in 3.1 innings against Atlanta in his previous outing. The 29-year-old left-hander set a season high in strikeouts and completed eight innings for the second time all year. Peterson owns a 3.18 ERA and 127:51 K:BB across 144.1 innings this season, and he's tentatively scheduled to close out a two-start week Sunday against Atlanta.
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Mets' David Peterson: Delivers six strong frames
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Peterson (7-4) earned the win Saturday, allowing one run on eight hits and three walks over six innings against the Giants. He struck out four.
The southpaw navigated traffic on the basepaths Saturday but limited the damage to just one run, picking up the win thanks to a two-RBI double by Mark Vientos in the top of the sixth inning. Peterson has consistently gotten the job done this season, logging 121 innings over 20 starts with a 2.83 ERA and 1.25 WHIP. His fastball velocity is down to a career-low 91.7 mph, but he's offset that with a personal best 3.0 BB/9. His 2025 numbers closely mirror his 2024 production, when he posted a 2.90 ERA and 1.29 WHIP across 121 innings in 21 regular-season starts.
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Mets' David Peterson: Impressive in no-decision
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Peterson didn't factor into the decision in the opening game of Thursday's doubleheader with the Orioles, allowing one run on five hits over seven innings. He struck out six.
Peterson was excellent Thursday, holding the O's scoreless through his first seven innings. However, he'd depart after allowing a leadoff single in the eighth to Colton Cowser, who'd ultimately score the tying run after the Mets turned to the bullpen. The 29-year-old Peterson has allowed just two earned runs over 13.2 innings in his last two starts after giving up 10 runs across 8.2 innings in his previous two outings. Overall, the left-hander is 6-4 with a 3.06 ERA, 1.24 WHIP and 93:37 K:BB through 18 starts (109 innings) this season.
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Mets' David Peterson: NYM-BAL postponed
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Peterson and the Mets won't face the Orioles on Wednesday, as the game was postponed due to rain.
The two clubs will play a doubleheader Thursday to make up for Wednesday's contest, and Peterson will take the mound to start the early game, per Laura Albanese of Newsday.
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Mets' David Peterson: Rebounds for sixth win
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Peterson (6-4) earned the win Thursday over the Brewers, allowing two runs (one earned) on five hits and three walks over 6.2 innings. He struck out four.
It was a strong bounce-back performance from Peterson, who'd given up 10 runs over 8.2 innings in his previous two starts. The left-hander lowered his ERA to 3.18 with a 1.27 WHIP and 87:37 K:BB over 17 starts (102 innings) this season. Peterson is currently lined up to face the Orioles on the road in his next outing.
