Severino turned in one of the strongest performances of his young career, firing seven scoreless innings, allowing three hits and two walks and striking out six. Dellin Betances and Aroldis Chapman each tossed an inning to lock down the win.
In a losing effort, Red Sox righty Rick Porcello allowed five hits and two earned runs over 6 2/3 innings, walking four and striking out nine.
Greg Bird gave the Yankees some insurance with an RBI single off the Green Monster in the sixth to score Judge, who started the rally with a two-out walk.