BOSTON — As the Yankees tried to pad their lead in the ninth inning on Saturday, Cody Bellinger delivered one of the team’s most impressive at-bats this season.

With Aaron Judge on second and fellow lefty Aroldis Chapman on the mound, Bellinger won a nine-pitch at-bat with an RBI double. The two-bagger, driven off The Green Monster after four foul balls, gave the Yankees an extra run in their 5-3, series-winning victory over the Red Sox .

“If you look at all the swings, he’s on everything,” Aaron Boone said. “He’s fouling pitches off. It’s full swing. It’s not just like battling and touching it and extending the at-bat and getting a mistake. It’s been impressive what he’s done against lefties.”

Bellinger, who took a 1.031 OPS against southpaws into Sunday’s series finale, said he wa

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