BOSTON — In the second inning of the Yankees’ 4-3 win over the Red Sox at Fenway Park on Saturday night, it looked as if Todd Frazier might be coming out of the game. He didn’t, fortunately for the Yankees. By the time it was over, he was an unsung hero in the victory.

Frazier got drilled in the left shin by a Chris Sale pitch that made his leg go numb. He was tended to by team medical personnel and stayed in. He seemed to be favoring one side as he jogged home when Tyler Austin followed with a three-run homer.

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Still, Frazier remained to make a pair of contributions in the sixth inning. He hit a solo homer off Sale for a 4-2 lead, then snared a line drive that likely would have driven in a Boston run.

His homer carried just enough to make it to the first row of the seats atop the Green Monster.

“Here all you’ve got to do is basically touch it — get it in the air and the ball will go,” Frazier said. “That’s what happened, man . . . I was just willing it out of here. I was like ‘Get up! Get up!’ and it was perfect placement.”

With speedy Mookie Betts on second in the bottom of the inning, Hanley Ramirez hit a rocket to the left side and Frazier dived to grab it. “To make that, that’s a big play,” he said. “That’s another run and we’re probably looking at extra innings. Didi [Gregorius, the shortstop] and I talked all game about how to position ourselves, and we were in the right place at the right time.”

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Frazier said adrenaline kept him in the game. “I felt it pretty much the whole game, but the adrenaline goes and you go. Adrenaline plays a big part,” he said. “Big character win today and I was glad to be a part of it.”