BOSTON — Rookie Michael Chavis hit a grand slam, Xander Bogaerts had three hits and Andrew Benintendi drove in three runs for Boston on Monday night to lead the Red Sox to a 10-8 victory over the Toronto Blue Jays.

Boston batted around for five runs in the first inning against starter Trent Thornton (3-7) and then sent 10 batters to the plate in the third, scoring five more.

Rick Porcello (7-7) gave up four runs and eight hits in six innings, striking out two. Brandon Workman pitched the ninth for his fourth save.

Four of the first five batters reached safely against Thornton before Chavis hit a 3-2 pitch 421 feet over the Green Monster in left-center to make it 5-0. It was his 16th homer, and the first grand slam of his career.

Toronto scored two in the second on Billy McKinney’s homer and two more in the third to make it a one-run game. But Rafael Devers hit a two-run single, Bogaerts added an RBI base hit and Benintendi drove them both in with a double off the Monster down the line.

Thornton, who threw six shutout innings in his previous start, allowed five runs on five hits and three walks while getting just four outs for Toronto, which has lost six of eight.

Rays 5, Yankees 4

NEW YORK — Travis d’Arnaud hit three home runs, including a startling, three-run shot with two outs in the ninth inning off Aroldis Chapman, and the Tampa Bay Rays overcame their Yankee Stadium woes to beat New York 5-4 on Monday night.

D’Arnaud went the other way on a full-count breaking ball, lofting a go-ahead drive that sailed over the leap of right fielder Aaron Judge. Several Rays players spilled from the dugout to congratulate d’Arnaud while a crowd of 43,173 fell silent.

The catcher tied a Tampa Ray record for homers in a game. It has been done five times, most recently by Evan Longoria in 2012.

The Yankees had been 49-0 this season when leading after eight innings. The Rays won for just the second time in seven games in the Bronx this year and cut the Yankees’ lead in the AL East to five games.

Andrew Kittredge (1-0) got the win despite allowing Edwin Encarnacion’s second homer of the game, a two-run shot in the eighth that put the Yankees up 4-2. Oliver Drake got one out for his first save.

Chapman (2-2) gave up a pair of singles to begin the ninth, struck out the next two batters and then was tagged for d’Arnaud’s ninth homer of the season.

The 30-year-old backstop has had a tumultuous season, having been designated for assignment by the Mets, signed by the Dodgers and traded to the Rays five days later.

But on this night, none of that mattered as he became the first catcher to hit three homers in a game against the Yankees.

D’Arnaud led off the game with a homer to right field on a fastball over the middle of the plate. In the third, he hit another to a similar location on the same pitch from James Paxton — a fastball down the middle.

D’Arnaud had never batted leadoff before this season, but the innovative Rays have slotted him there seven times. He reached base in all five of his plate appearances Monday, with two walks. It was the fourth multihomer game of d’Arnaud’s career and second this season.

Tampa Bay had lost 14 straight series openers at Yankee Stadium.

Before Encarnacion’s go-ahead homer, the Yankees kept themselves in the game with some outstanding defense.

Judge threw out a runner at third from right field, catcher Gary Sanchez picked a runner off second and Gio Urshela showed off his elite glove at third. Center fielder Aaron Hicks also ran down two long drives.

Encarnacion, who began the day batting just .139 since being acquired from Seattle last month, hit a solo shot in the fourth off Blake Snell. After hooking a fastball foul, the slugger drove the next pitch in the same direction a few feet inside the foul pole.

Urshela made it 2-all with a home run in the seventh. Encarnacion hit his 27th of the season, good for second in the AL.

Snell bounced back from his last start at Yankee Stadium, in which the AL Cy Young Award winner gave up six runs while getting only one out last month. The left-hander tossed five innings of one-run ball.

TRAINER’S ROOM

Rays: RHP Tyler Glasnow (forearm) will be shut down for another two weeks, manager Kevin Cash said. Glasnow is 6-1 with a 1.86 ERA, but hasn’t pitched since May 10. He had been eligible to come off the injured list last week, but Cash said the team is being cautious with the 25-year-old righty.

Yankees: Ace starter Luis Severino and reliever Dellin Betances, both out all season with lat injuries that followed shoulder trouble, began their throwing programs. They each made 25 tosses from 60 feet in right field before the game. There is no timetable for either All-Star right-hander to return, but both expect to pitch in the majors this season.

Severino said he would be open to working out of the bullpen, adding the team hadn’t mentioned that possibility. “If they need me quicker as a reliever, I would say yes,” he said.

Betances said he had compared notes with Severino on their recoveries.

“We’re just trying to do what we love,” Betances said.

Manager Aaron Boone was just glad to see them back on the field.

“I greeted them with ‘happy throwing day,'” he said.

UP NEXT

CC Sabathia (5-4) will start his fifth game against the Rays this season on Tuesday night. He is 1-0 with a 2.63 ERA in those outings. The Rays had yet to announce a starter.

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