CHICAGO — What should have been a feel-good performance and nice segue into the Subway Series for the Mets turned into a demoralizing win Sunday night.

Edwin Diaz was ejected upon entering for the bottom of the ninth inning after umpires inspected his right hand and glove and deemed it in violation of MLB’s rules on sticky substances.

Drew Smith and Jake Diekman were summoned to get the final three outs of the Mets’ 5-2 victory over the Cubs at Wrigley Field, but Diaz now faces an automatic 10-game suspension for the sticky substance ejection.

Max Scherzer faced similar discipline with the Mets last April after he was deemed in violation of the rule during a game at Dodger Stadium. Smith was also ejected for violation of the rule later in the season.

The Mets will have to play a man short throughout the course of the suspension.

It comes as the Mets prepare for two games at Citi Field against the Yankees after winning four straight series.

Before the ninth-inning issues, Luis Severino delivered six shutout innings, a marked improvement from his Tuesday outing in Texas in which he surrendered six earned runs. On this night, the Mets received homers from Francisco Lindor, Brandon Nimmo and Mark Vientos in improving to 13-6 in June.

Severino was originally supposed to face his former team, the Yankees, on Tuesday. But late last week manager Carlos Mendoza adjusted the rotation and moved David Peterson to the Subway Series opener. Severino started against the Cubs instead. Mendoza’s stated reasoning was he wanted a right-hander to face the Cubs and lefty against the Yankees.

But Severino admitted to The Post he was “a little bit” disappointed he wouldn’t get to face the Yankees this week and said he would push to pitch in the second installment of the Subway Series, after the All-Star break in The Bronx.

Severino rolled into the sixth against the Cubs, but allowed a leadoff single to Miguel Amaya before plunking Nico Hoerner. After Michael Busch struck out, Severino waged an epic battle with Cody Bellinger and won. Bellinger struck out on the 12th pitch of the at-bat. Mendoza visited the mound and stuck with Severino, who fell behind 2-0 in the count to Seiya Suzuki before retiring the Cubs DH on a fly to center.

All told, Severino struck out 10 — his first time this season reaching double digits — and allowed three hits without walking a batter over 102 pitches.

Severino continued his dominance against the Cubs this season. On April 29 he took a no-hitter into the eighth inning against them at Citi Field before Dansby Swanson singled and Severino, who allowed one run, took a no-decision in a game the Mets lost 3-1.

Lindor and Nimmo on this night went back-to-back with homers in the third against Javier Assad that gave the Mets a 3-0 lead. After Harrison Bader’s double in the inning, Lindor worked the count full and lofted a fly ball to left that kept carrying into the bleachers. Nimmo followed with a homer into the same area. It marked the third this season the Mets hit back-to-back homers. Nimmo’s homer was his fourth in his last six games and gave him 11 for the season. Lindor’s homer was his 13th — leaving him three behind Pete Alonso for the team lead.

Bader’s double in the fifth — almost a carbon copy of the grounder he sent along the third-base line in his previous at-bat — helped the Mets extend their lead to 4-0 in the fifth. Lindor was hit by a pitch, and following a double steal, Nimmo walked to load the bases before J.D. Martinez’s groundout brought in the run.

Assad, who entered with a 2.75 ERA, lasted only 4 ¹/₃ innings and allowed four earned runs on seven hits with one walk. The right-hander allowed only one run over five innings when he faced the Mets on April 30 at Citi Field.

The Cubs struck against Dedniel Nunez in the seventh. After Ian Happ’s leadoff single, Christopher Morel hit a 420-foot homer to center that sliced the Mets’ lead to 4-2.

Vientos countered with a 451-foot bomb to center field in the eighth that extended the Mets’ lead to 5-2.

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