The Yankees turned to rolling ace Luis Severino to ride the supposed momentum of Fridays stirring comeback victory the Red Sox.

Of course, first-place Boston then pulverized the All-Star righty for eight runs and knocked him out in the fifth inning on Saturday, sending the Yanks to an unsightly 10-5 loss at the Stadium.

Red Sox rookie Andrew Benintendi crushed two homers and drove in six against Severino, who had won each of his previous four starts with a 0.70 ERA.

He wasnt executing his pitches today and made some mistakes, Joe Girardi said of Severino. Hed been so good and executing so well. We havent seen it for a while, but it just shows that hes human.

Gary Sanchez had clubbed a two-run home run against Boston lefty Drew Pomeranz in the first inning for the Yanks (61-54). Chase Headley and Jacoby Ellsbury added back-to-back homers in the ninth.

The Bombers, who slipped back to 4.5 games behind the Red Sox in the AL East, are slated to start rookie Jordan Montgomery against Cy Young frontrunner Chris Sale in Sunday nights series finale.

Brett Gardner made a sliding catch of Xander Boegarts liner in Bostons five-run third and then doubled off Hanley Ramirez at second base to end the inning. Gardner also threw out Rafael Devers at second trying to stretch a single into a double in the eighth.

Two walks by Luis Severino, an error by third baseman Todd Frazier, a two-run single by Mookie Betts and Andrew Benintendis first of two three-run shots gave Boston a 5-2 lead in the third.

Benintendi, 23, became the youngest Red Sox player ever with six RBI in a game against the Yankees since that became an official stat in 1920. He now has 65 RBI for the season, 13 behind fellow rookie Aaron Judge.

2,784: One year ago Saturday, Alex Rodriguez made his final appearance for the Yanks, the 2,784th game of his star-crossed major-league career.

Gary Sanchez homered, his 19th of the season, and doubled in four trips. He is 6-for-13 with three homers in his career vs. Boston starter Drew Pomeranz.

Judge went 0-for-4 with two strikeouts and a double-play grounder to drop his average to .161 (15-93) since the All-Star break. The skidding rookie also extended his team record by striking out in his 29th consecutive game.

Yankees vs. Red Sox

Sunday, Aug. 13, 8:05 p.m. TV: ESPN

LHP Jordan Montgomery (7-6, 4.05) vs. LHP Chris Sale (14-4, 2.57)