The Yankees are alive, in part, because of Ryan McMahon.

The third baseman is happy to report that he, too, is alive.

“I thought he was dead,” said Austin Wells, who had the best view of a play that will be remembered for a long time — especially if this Yankees season ends with more champagne than was sprayed Thursday after the 4-0 series-winner against Boston in The Bronx.

Playing the part of Derek Jeter in the deciding Game 3 was McMahon, who sacrificed his body, tumbled across enemy lines , never lost the ball and lived to tell the tale.

“Adrenaline kind of kicked in,” said McMahon, who subbed in as a defensive replacement in the sixth inning, was shifted over with lefty-swinging Jarren Duran at the plate in the eighth and embarked on a long sprint toward the visiting dugout on

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