Narvaez, Bruce homer as Mariners drop Sox

SEATTLE — The rebuilding Seattle Mariners are off to a surprising start.

The lineup is leading the way.

Omar Narvaez hit a three-run homer off

Rick Porcello in Seattle’s seven-run third inning, sending the Mariners to a 10-8 victory over the Boston Red Sox on Sunday.

Dee Gordon had two hits and three RBIs as Seattle put together another impressive performance at the plate. The Mariners scored 34 times while taking three of four from the defending World Series champions in their first series at home.

“Right now we’ve got really good confidence, and we know what we can do,” Narvaez said. “Everybody’s basically enjoying the game. Laughing, putting a smile on our face.”

Jay Bruce also connected for Seattle, and Mitch Haniger had two hits and two RBIs. The Mariners have 15 homers, hitting at least one in every game in their 5-1 start.

“I knew we’d hit some homers,” Seattle manager Scott Servais said. “It seems like the ball is carrying here, but those balls are hit. Not too many cheap ones getting out of here.”

Porcello (0-1) allowed nine runs, four earned, and six hits in 2 2/3 innings. The 2016 AL Cy Young Award winner struck out three and walked four.

Starters Porcello, Chris Sale, Nathan Eovaldi and Eduardo Rodriguez combined to give up 22 earned runs on 27 hits in the four games against Seattle.

“If you told me coming into the series that it was going to be this way I’d say, ‘No chance,’ ” Red Sox manager Alex Cora said. “But it’s baseball. Those guys are going to be OK throughout the season. We know that.”

The Red Sox almost came back in the ninth. Cory Gearrin came in to pitch for Seattle and walked the bases loaded with one out. Gearrin was then replaced by Chasen Bradford, who walked pinch hitter Blake Swihart to force in a run before retiring Christian Vazquez and Jackie Bradley Jr. to end the game.

Narvaez’s drive to right put Seattle ahead to stay. Haniger capped the big inning with a two-run double.

Mariners starter Wade LeBlanc (1-0) allowed six runs, and seven hits in 5 1/3 innings.

J.D. Martinez hit an RBI single in Boston’s three-run first, and then belted a threerun drive in the fourth for his 1,000th career hit.