<p>MILWAUKEE — Left-hander David Peterson was an All-Star last season.</p><p>But ever since his trip to the Midsummer Classic, Peterson — whom the <a class="Link" href="https://chicago.suntimes.com/cubs" target="_blank" >Cubs</a> acquired in <a class="Link" href="https://chicago.suntimes.com/cubs/2026/06/25/cubs-jed-hoyer-trade-mets-david-peterson-mlb-trade-deadline-pitching-injuries-injured-list-bryse-wilson" target="_blank" >a trade Thursday with the Mets</a> — has had a lot of poor results.</p><p>After posting a 3.06 ERA before the All-Star break last season, he had a 6.34 ERA after it and has struggled to a 6.09 mark this season.</p><p>On Saturday, for the first time in his pro career, he’ll be pitching for an organization other than the Mets, getting dropped into a National League Central battle as he makes his Cubs debut against the Brewers.</p><p>It will be a new look for Peterson, with the Cubs hoping the change will do him good.</p><p>‘‘There’s some aspect of this [being] a change of scenery,’’ Cubs manager Craig Counsell said before the game Friday. ‘‘We all can acknowledge that sometimes a change of scenery is a good thing.</p><p>‘‘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.’’</p><p>The big talking point in the wake of the deal — a long-gestating move that came to fruition once the Cubs felt some urgency after right-handers Edward Cabrera and Ben Brown hit the injured list this week — was that an infield stocked with Gold Glove winners should benefit Peterson, who has one of the higher ground-ball percentages in the majors.</p><p>Watching Mets infielders commit one error after another during the Cubs’ four-game sweep this week at Citi Field gave that argument some weight.</p><p>But even without digging into the specific differences between his new club and his old one, sometimes all it takes is a new logo to force a reset.</p><p>‘‘When I was there, my whole goal and focus was to help the Mets win games,’’ Peterson said.