NEW YORK — There were a handful of decisions that Aaron Boone made on Tuesday, in the Yankees ’ Game 1 loss to the Red Sox , that proved to be costly.

Asked on Wednesday, before Game 2 of the Wild Card Series against Boston, what he regrets most, the manager picked a late-game defensive substitution.

It was the decision to pull Amed Rosario and bring Jazz Chisholm Jr. in at second base in the eighth inning that didn’t sit right with him.

“Should I have kept Rosario in,” Boone said. “That was the one knowing we were down at that point.”

Chisholm came in as a defensive sub with the Yankees trailing. He then had to face lefty closer Aroldis Chapman with the game on the line one inning later. Chisholm flew out to shallow right field, the second of three at-bats in a row where the Yank

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