Chris Sale struck out 12 in his latest dominant performance, but Boston trailed 2-1 before the 20-year-old Devers connected on a 103 mph fastball and became the second left-handed hitter to homer off Chapman in his eight-year career.
Bradley put Boston ahead with a single before Austin Romine answered with his first career triple , a drive that glanced off the mitt of Betts, a 2016 Gold Glove winner, as he backed into the right-field wall.
Cool and clear-headed, New York rookie Jordan Montgomery matched Sale for 5 1/3 innings and left to a warm hand from a sellout crowd of 46,610 that included actor Leonardo DiCaprio, who was wearing a Yankees cap.
Red Sox: RHP Doug Fister (2-5, 5.03 ERA) faces AL Central-leading Cleveland at Fenway Park on Monday night in the makeup of an Aug. 2 rainout.
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