BOSTON — Andrew Benintendi has continued the hot hitting out of the leadoff spot for injured star Mookie Betts.

Benintendi hit a three-run homer to cap a five-run fourth inning, J.D. Martinez added a solo homer, and the Boston Red Sox coasted to an 8-3 victory over the Toronto Blue Jays on Monday.

With regular leadoff hitter Betts missing his second straight game because of tightness on his left side that he felt in batting practice Sunday, Benintendi added a triple and a single, improving to 4 for 8 in the two days.

“I’m seeing it pretty well right now,” Benintendi said in his usually quiet voice.

Reminded that it was his first career homer over the Green Monster, the 23-year-old said: “I’ve hit a few over there in BP, but not in a game.”

Betts entered the day with a major-league-leading .359 batting average.

Jackie Bradley Jr. added an RBI double, scored twice and made a spectacular catch in center field as Boston won for the seventh time in nine games.

It was the Blue Jays’ 11th loss in 15 games, dropping them to 2-5 against the Red Sox this season. Teoscar Hernandez had an RBI triple and double for Toronto.

David Price (5-4) labored through five innings, allowing two runs and four hits with four strikeouts and four walks.

The lefty took a hard shot from Yangervis Solarte that bounced off his glove and appeared to carom off his chest in the first inning before picking it up and throwing him out.

“You know me, I’m the softest guy in this clubhouse,” Price said, joking. “If that had bothered me, I was coming out of the game.”

The Red Sox took charge with their big fourth inning, pulling ahead 6-1 against Aaron Sanchez (2-5).

Brock Holt had a sacrifice fly and Bradley hit a run-scoring double before Benintendi lofted a fly ball into the first row of Monster seats.

“They get a couple singles in that inning, a bloop, and then a blast,” Sanchez said.

Martinez then led off the fifth with his 17th homer, a drive that completely left Fenway Park over the Monster, tying him with Betts for the team lead.

“They’ve got a tough lineup, they always have,” Blue Jays Manager John Gibbons said. “It’s tough to shut ’em down.”

Sanchez was tagged for seven runs and nine hits in five innings, falling to 0-3 in his past five starts with a 5.96 ERA.

TRAINER’S ROOM

Blue Jays: 3B Josh Donaldson left the game with left calf tightness after getting a single and walking twice.

“It’s a little sore right now, still a little tight,” he said. “We’re going to do some treatment and stuff on it and see, just kind of play it by ear, see how it responds.”

Red Sox: Manager Alex Cora gave second baseman Dustin Pedroia the day off after he played two straight games, his first since returning from offseason knee surgery.

LOOK AT THAT

Bradley made a jumping catch with his back completely turned to home plate on the warning track against Kendrys Morales in the sixth. Holt ran over, raised his arms and then walked over and gave him a hug.

“That’s kind of what Jackie does,” Benintendi said. “He makes those kinds of plays all the time.”