Last year, the Yankees helped fuel the Indians’ run to the World Series, by sending Andrew Miller to Cleveland in a midseason trade. Sunday night, the All-Star reliever was responsible for extending his former team’s season.

After swooping in to keep Game 3 of the ALDS scoreless — saving starter Carlos Carrasco from a bases-loaded jam in the sixth inning — Miller uncharacteristically stumbled, and was tagged with the Indians’ first loss of the series after surrendering a stunning, game-deciding home run to Greg Bird in the Yankees’ 1-0 win in The Bronx.

“It stinks. I’m the guy who lost the game,” Miller said. “I made a mistake and I try to learn from it and move on. You face a lot of the same guys in a series like this. You tip your cap. It was a good swing.”

It was an unthinkable swing.

Miller hadn’t allowed a run in his previous 13 appearances. All season, he had only given up one home run to a lefty, the Dodgers’ Cody Bellinger on June 13.

Just one inning earlier, the southpaw had been a postseason savior again, coming through in the Yankees’ biggest at-bat of the season. Replacing Carrasco with two outs and the bases loaded of a scoreless game, Miller sapped all of the energy from Yankee Stadium, forcing Starlin Castro into a harmless inning-ending pop-up.

The Yankees had missed their best chance against the towering southpaw, but not their last.

After throwing back-to-back breaking balls to Bird to open the seventh, Miller followed with a 95-mph fastball, which the young first baseman blasted into the second deck in right field.

Miller (0-1), who had thrown 2 ¹/₃ scoreless innings in the first two games of the series, was removed after throwing just two-thirds of an inning.

“I thought it was a good time to [throw a fastball], a good time to set up a lot of options and he was ready for it,” Miller said. “I wanted to be more away. I just made a mistake. In hindsight, I should’ve thrown a different pitch.

“You hate to give them a chance and unfortunately I did. It’s never over until you’re jumping up and down and moving to the next round.”

Miller could still get the Indians there. After throwing just 12 pitches in the outing, he will be available to pitch again in Game 4 Monday night.

“He might pitch forever [Monday],” manager Terry Francona said.