SAN FRANCISCO — Mike Yastrzemski hit a three-run homer as the San Francisco Giants defeated the Seattle Mariners 10-1 for their fifth straight win Wednesday night under skies turned orange by raging wildfires in Northern California.

Players took batting practice with the lights turned on at Oracle Park on a late-summer afternoon. Some ash flakes rained down on the ballpark and the smell of smoke was noticeable but not overpowering.

“Certainly, it’s a strange look when we all woke up this morning and found the orangish-red hue to the sky,” Giants manager Gabe Kapler said.

“Walking onto the field today was certainly different in the middle of the afternoon and having the sky look a little bit dark, but my understanding is the air quality is OK and of course we’ll keep tabs on it and if anything changes we’ll make the best decisions for the health and well-being of our players,” he said.

Tyler Anderson (2-3) pitched six shutout innings of three-hit ball for the win. The left-hander struck four and walked one as he won for the first time in three starts since pitching his first career complete game Aug. 22 against Arizona.

Mariners starter Nick Margevicius (1-3) struck out six his first time through the order before the Giants broke through in the bottom of the third of a scoreless game. He gave up a season-high seven runs in 4 2/3 innings.

Joey Bart and Brandon Crawford were aboard on consecutive singles leading off the third when Yastrzemski hit a high-arching shot to right for his ninth homer on a 1-2 fastball Margevicius left over the plate.

Yastrzemski leads the majors with eight two-strike home runs.

Giants third baseman Evan Longoria got two hits and drove in three runs in his first time back in the lineup after missing two games with a glute strain.

The Giants scored at least four runs in their 11th straight game, their longest such streak since scoring four or more in 10 consecutive games in 2007.

ROSTER MOVES

The Mariners added right-handed reliever Jimmy Yacabonis from their alternate training site. They optioned right-hander Brady Lail to the site. … The Giants signed switch-hitting first baseman Justin Smoak to a minor league contract. Smoak batted .186 with five homers and 15 RBI in 33 games this season with the Brewers before being released Sunday. He was added to San Francisco’s player pool.

TRAINER’S ROOM

Mariners: RHP Ljay Newsome is expected to make his next scheduled start after being struck in his pitching hand by a line drive in Tuesday’s game, manager Scott Servais said. Newsome will test his hand playing catch Friday. “We’re pretty optimistic,” Servais said, “but it’ll depend on how he feels when he goes out there on Friday.”

Giants: LHP Drew Smyly is expected to be added to the roster Thursday, Kapler said.

UP NEXT

Mariners: After an off day LHP Yusei Kikuchi (2-2, 5.23) will look to win his third straight start in Friday’s series opener in Arizona.

Giants: Haven’t named a starter for Thursday’s opener in San Diego.

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