Peterson didn't factor into the decision in the second game of Friday's doubleheader against the Red Sox, allowing three hits and two walks over five scoreless innings. He struck out six.
The Cubs ended up getting swept in the twin bill, but it wasn't from a lack of effort on Peterson's part. The southpaw tossed 57 of 91 pitches for strikes, and he heads into the postseason with significant momentum -- since the All-Star break, Peterson's delivered a 2.73 ERA, 1.32 WHIP and 67:28 K:BB in 66 innings while going 5-1.
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Cubs' David Peterson: Impressive again in ninth win
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Peterson (9-8) earned the win Sunday over the Reds, allowing a run on three hits and a walk across six innings. He struck out seven.
Peterson has now turned in back-to-back quality starts while holding opponents to just three runs across 16.1 innings in his last three outings. The 31-year-old left-hander sports a 4.96 ERA, 1.51 WHIP and 131:63 K:BB across 143.1 innings between the Cubs and Mets this year. Peterson will likely make one more regular-season start, currently slated to come next weekend in Boston.
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Cubs' David Peterson: Sharp in win
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Peterson (8-8) allowed one run on three hits and three walks while striking out seven over six-plus innings to earn the win over Atlanta on Monday.
Peterson picked up his first quality start since Aug. 22 with this performance. He's struggled to provide length at times, covering 25 innings over his last five appearances while giving up 12 runs in that span. For the season, the veteran southpaw has a 5.11 ERA, 1.55 WHIP and 124:62 K:BB through 137.1 innings over 30 games (21 starts) between the Cubs and Mets. He's lined up for a road start in Cincinnati this weekend.
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Cubs' David Peterson: Knocked around in eighth loss
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Peterson (7-8) took the loss against the Brewers on Wednesday, allowing six runs on seven hits and four walks in 3.2 innings. He struck out four.
The southpaw never quite got going Wednesday, surrendering a pair of runs in the opening frame and being scored upon in three of the four innings he worked. It marked just the third time through 12 appearances that Peterson conceded more than two runs in a Cubs uniform. Chicago plans to bring Edward Cabrera (blister) back as a reliever eventually, positioning Peterson for a rotation spot the rest of the way. He'll carry a 4.58 ERA, 1.46 WHIP and 50:26 K:BB over 59 innings with Chicago into a road rematch with Milwaukee.
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Cubs' David Peterson: Fans six in no-decision
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Peterson didn't factor into the decision in Friday's 10-8 loss to the Reds, allowing two runs on six hits and three walks over five innings. He struck out six.
The southpaw left the mound after 88 pitches (54 strikes) with the Cubs holding a 3-2 lead, but Trent Thornton immediately coughed it up in the top of the sixth once Peterson was out of the game. Peterson has given up more than two earned runs just once in his last nine outings, posting a 2.35 ERA, 1.26 WHIP and 41:19 K:BB over 46 innings during that span. He's set to make his next start at home next week against the Brewers.
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Cubs' David Peterson: Settles for no-decision Saturday
Rotowire
Peterson took a no-decision against the Mariners on Saturday, allowing two runs on four hits and two walks in six innings. He struck out eight.
After recently shifting to the bullpen, Peterson delivered six strong innings in his return to the rotation Saturday following Edward Cabrera's (finger) placement back on the injured list. Peterson, who had been in line for the win before Jacob Webb blew the save, fanned a season-high eight in his third quality start of the season, all of which have come with the Cubs. Peterson will bring a solid 3.93 ERA, 1.31 WHIP and 40:19 K:BB over 50.1 innings for the Cubs into his next scheduled outing against the division-rival Reds.
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Cubs' David Peterson: Part of Saturday's pitching plan
Rotowire
Cubs manager Craig Counsell said Wednesday that Peterson will "be involved" in the pitching plan for Saturday's game in Seattle, Meghan Montemurro of the Chicago Tribune reports.
With Edward Cabrera (finger) landing back on the 15-day injured list after just one start with the big club, a spot in the Chicago rotation has reopened. Peterson ended up losing his spot in the rotation when Cabrera returned this past weekend, but the former looks poised to slot back in either as a traditional starter or bulk reliever Saturday. The southpaw has logged a 4.06 ERA and 32:17 K:BB over 44.1 innings covering eight starts and one relief appearance for the Cubs.
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Cubs' David Peterson: Nabs seventh win
Rotowire
Peterson (7-7) earned the win against the Nationals on Wednesday, allowing four runs (three earned) on nine hits and three walks in six innings. He struck out five.
Peterson got knocked around a bit Wednesday, but he hung in there for his sixth consecutive start of at least five innings. The southpaw has conceded three runs or fewer in all but one of first eight outings for the Cubs, though the one exception was a 10-run implosion versus St. Louis on July 3. Peterson has a 4.19 ERA, 1.37 WHIP and 31:16 K:BB over 43 innings for the Cubs ahead of his next scheduled appearance against the crosstown-rival White Sox.
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Cubs' David Peterson: Will start Thursday
Rotowire
Peterson is slated to start Thursday's game against Toronto at Wrigley Field, Jared Wyllys of AllCHGO.com reports.
Though trade-deadline pickups Kevin Gausman and Clay Holmes (fibula) are slated to make their first starts for the Cubs this weekend, Peterson will keep his spot in the rotation for now. The left-hander tied his season high with eight strikeouts in his most recent start last Saturday against the Yankees and owns a 4.36 ERA, 1.12 WHIP and 22:10 K:BB in 33 innings over his first six starts with the Cubs since being acquired from the Mets on June 25.
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Cubs' David Peterson: Strikes out eight in no-decision
Rotowire
Peterson did not factor into the decision in Saturday's 5-2 win against the Yankees, allowing two runs (one earned) on five hits and no walks with eight strikeouts over 6.1 innings.
Despite posting a quality start and tying a season high with eight punchouts, Peterson departed in line for the loss after allowing a solo homer in the seventh inning before the Cubs eventually rallied to take him off the hook. The southpaw has been excellent to open the second half, yielding just three earned runs over three outings with a solid 15:3 K:BB in that span. He'll carry a 5.52 ERA, 1.48 WHIP and 85:40 K:BB across 101 innings with the Mets and Cubs into a home matchup with the Blue Jays next week.
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Cubs' David Peterson: Posts best start of season
Rotowire
Peterson (5-7) notched the win over Detroit on Tuesday, allowing three hits and issuing one walk while striking out four batters over 6.2 scoreless innings.
Peterson was sharp, yielding just one extra-base hit and four total baserunners. He retired 11 straight batters in one stretch and completed six frames for the first time this season. Peterson has won two of his four starts since joining Chicago in late June, and he's given up two runs or fewer in three of those outings, though the lone exception was a 10-run, 3.2-inning blowup against St. Louis. The veteran lefty has shown enough to hold down a spot in the rotation at least until some of the Cubs' injured starters get healthy, and he's lined up to make his next start on the road against the Cardinals.
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Cubs' David Peterson: Shines in Cubs debut
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Peterson (4-6) notched the win Saturday against the Brewers, allowing two runs on five hits and no walks in 5.2 innings. He struck out two.
Making his Cubs debut, Peterson immediately entered the rotation after bouncing around as a swingman with the Mets. The 30-year-old left-hander fell one out shy of what could've been his first quality start of the year, but it was still his longest outing so far. Peterson, who entered Saturday with a high groundball rate of 52.9 percent, could benefit from the elite defense of Nico Hoerner and Dansby Swanson in the Cubs' middle infield going forward. He'll carry a 5.86 ERA, 1.59 WHIP and 65:30 K:BB over 73.2 innings into his next scheduled outing against the Cardinals.
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Cubs' David Peterson: Dealt to Cubs
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The Cubs acquired Peterson from the Mets on Wednesday in exchange for infielder Cole Mathis (undisclosed), Jeff Passan of ESPN.com reports.
Peterson had endured a rough season with the Mets, turning in a 6.09 ERA and 1.65 WHIP in 68 innings across 16 appearances (eight starts). However, the Cubs will gladly take all the rotation arms they can get at this point, as Edward Cabrera (hamstring) and Ben Brown (neck) became the fifth and sixth Chicago starting pitchers to land on the injured list Wednesday. Peterson is expected to provide immediate aid to the rotation and could make his first start with the Cubs as soon as Friday at Milwaukee, after he threw 79 pitches Sunday in his final appearance with the Mets.
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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: 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
Rotowire
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
Rotowire
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
Rotowire
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.
