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Peterson ends the regular season having allowed three runs over 21 1/3 innings in his final four starts. He’s 6-2 with a 3.70 ERA overall in 15 starts and one relief appearance since being picked up from the Mets. It’s going to be really interesting to see how the Cubs deal with the rotation in the postseason, given that Peterson, Matthew Boyd and Shota Imanaga are all currently performing better than Clay Holmes and Kevin Gausman, both of whom seemed like locks to be among the team’s top three starters a few weeks ago.

Peterson struck out seven and walked one. He’s come up big for the Cubs, going 5-1 with a 2.95 ERA in 12 starts since the All-Star break. He’ll finish up the regular season against the Red Sox on Saturday.

Peterson gave up three hits, walked three and struck out seven. He improved to 8-8 with the win. Peterson rebounded after failing to complete five innings in each of his last two starts. He has a 4.15 ERA in 13 starts since he joined the Cubs. Peterson is lined up to face the Reds on the road this weekend.

The run came right away in the first, but Peterson, who walled six hits and walked three, was in trouble throughout. When he was lifted from a 1-1 game, it was with runners on first and second and one out in the fifth. Neither runner scored, though, as a single with two outs saw Jackson Chourio barely get thrown out at home to end the inning. Peterson failed to complete five innings for the second straight start, but he did keep the Cubs in the game. He’ll likely face the Braves next on Monday.

Peterson had a rough time with the Brewers here. It was arduous from the jump as he managed to struggle through a 33-pitch first inning after retiring the first two batters he faced. There were no homers and no balls were hit particularly hard, but the Brewers battled, worked deep counts, found holes, and eventually Peterson let his frustration take over with a four-pitch walk to Gary Sánchez with the bases loaded. The fourth inning went in a very similar way and Cubs’ manager Craig Counsell pulled Peterson before he could get through it. This is still just the second time in 12 starts since being traded to the Cubs where he’s let up more than two runs and he’ll have a chance to get right in his next scheduled start against these same Brewers in Milwaukee. That will begin a two-start week where he also faces the Pirates at home.

Peterson departed with a one-run lead, only to see Trent Thornton give up five runs in the sixth. It’s Peterson’s fourth no-decision to go along with one run in five starts this month. Oddly enough, the victory came in the only one of the starts in which he allowed more than two runs. He’ll face the Brewers next.

Peterson surrendered a leadoff homer to Randy Arozarena in the first inning. He settled in for three scoreless innings before giving up one more run in the fifth on a bases-loaded groundout. Peterson would give the Cubs one more scoreless frame, ending his day after six innings with eight strikeouts. The 30-year-old left-hander will take a 5.17 ERA, 1.50 WHIP, and a 103/49 K/BB ratio across 118 1/3 innings into a start against the Reds in Chicago on Friday.

Peterson hasn’t pitched poorly since joining the Cubs, but he’ll get squeezed back into a long relief role for the time being now that Cabrera is ready to return. That should strip away any lingering mixed league fantasy value that he may have had.

Peterson gave up nine hits, walked three and struck out six. He improved to 7-7 on the season with the win. Since coming over to the Cubs this year, Peterson is 4-1 with a 4.19 ERA and 31 strikeouts in 43 innings over eight starts. He’s lined up to face the White Sox at home next Tuesday, but won’t get a two-start week with the Cubs only playing six games next week.

Peterson allowed seven hits and walked three, but the one run scored on a balk after Peterson tried a third pickoff of George Springer at first with runners on the corners. Peterson has given up a total of six runs — five earned — in five starts since being lit up for 10 runs by the Cardinals on July 3. He’ll likely face the Nationals next Wednesday or Thursday.

Peterson came in with a 14/10 K/BB in 26 2/3 innings for the Cubs, but he was at 8/0 tonight. It was his second eight-strikeout game of the year, with the also other coming against the Yankees when he was still with the Mets on May 16. Peterson will face the Royals next weekend, so he has some utility as a streaming option.

Peterson gave up eight hard-hit balls but only three hits, allowing him to turn in a solid performance while striking out three and walking two. He moved to 3-1 with a 5.06 ERA in five starts for his new team. He’ll face the Yankees next time out, and while it’s definitely a good time to face the Bombers, he still doesn’t seem like an ideal streaming play.

Peterson won for the second time in four starts for the Cubs and the fifth time overall this season. He still has a 5.57 ERA for his new team, but 10 of the 13 runs he’s surrendered came in one start versus the Cardinals. Tonight’s effort ensures that he’ll stick in the rotation with Aaron Civale around, and he’ll get a chance for some revenge against the Cardinals on Monday.

Tyler O’Neill crushed a second-inning offering from Peterson for the lone run. Despite the walks, the Orioles only managed two at-bats with runners in scoring position. Peterson’s now alternated two decent starts with the Cubs against one mega-clunker that has his season ERA at 6.45. Even with the improvement, we’re not ready to recommend him in fantasy leagues.

Peterson’s second start as a Cub did not go nearly as smoothly as his first. He allowed three runs apiece in each the second and third innings on his way to an ugly 10 spot. That rally in the second was the most frustrating because Peterson retired the first two batters he faced and had the Cardinals’ seven, eight, and nine hitters coming up. Suddenly, a double, single, and homer turned into three runs. Similarly, before being yanked in the fourth, he got two quick outs and then proceeded to walk three consecutive batters. Then he was pulled after a run-scoring single and reliever Bryse Wilson gave up a home run to let that last two inherited runners score. In the end, Peterson had poor command and was hit hard just like in many of his other starts this season.

Peterson gave up five hits, walked none and struck out two. He improved to 4-6 with the win. Peterson’s Cubs tenure got off to a rocky start when Jackson Chourio homered on the first pitch he threw in Cubs blue. The 30-year-old left-hander was able to settle in and pitch into the sixth inning before handing it off to the bullpen with a 6-2 lead. Peterson has a 5.86 ERA, but his 4.04 xFIP points to a potential bounce back. He’s lined up to face the Cardinals at home next weekend.

It’s a decent spot for Peterson to make his Cubs debut since Milwaukee ranks 22nd as a team in OPS against left-handed pitching this season. The 30-year-old southpaw was acquired from the Mets to shore up Chicago’s injury-ravaged rotation earlier this week. His immediate fantasy appeal is strictly limited to deeper mixed leagues given his struggles this year, but it’s possible a change of scenery helps him get back on track.

Peterson joins a beleaguered Cubs’ rotation to provide some stabilization, but it’s worth noting that he’s been far from a reliable option for most of 2026 with a 6.09 ERA and 1.65 WHIP over his 68 innings with New York prior to the move. The left-hander has had success in the past prior to this year’s scuffles, and because of the litany of injuries to the Chicago staff, he’s going to be given some runway. He should make his debut for the Cubs in the coming days.

Peterson provides Chicago’s injury-ravaged rotation with an immediate injection after struggling to a career-worst 6.09 ERA, 1.65 WHIP and 63/30 K/BB ratio across 68 innings for the Mets this season. The 30-year-old southpaw could certainly benefit from a change of scenery and should get an extended run with the Cubs who lost both Ben Brown (neck) and Edward Cabrera (hamstring) to the injured list earlier this week in addition to missing Cade Horton (elbow) and Jameson Taillon (hamstring) already. The Athletic’s Will Sammon adds that first base prospect Cole Mathis, who has posted a .981 OPS in the lower minors this season, is heading to the Mets in the deal.

Peterson walked back-to-back batters to start the game, which set the tone for the evening. The southpaw ran a ton of deep counts and it ultimately cost him. His biggest downfall was a three-run homer off the bat of Kyle Schwarber in the second inning. Peterson struck out five and walked four in the loss and now holds a 6.09 ERA on the year. He didn’t exactly make the case to get more starts in the near future, but the Mets aren’t exactly overflowing with options at the moment.