Athletics 6, Mariners 1: George Kottaras continued his power surge with a two-run homer and Brett Anderson tossed six solid innings as Oakland extended its road winning streak to eight games.
With the contest tied 1-1, Stephen Drew put the Athletics ahead for good in the fourth with a one-out RBI single. Two batters later, Kottaras belted his fourth shot in as many games for a 4-1 advantage. Coco Crisp completed the four-run uprising with an RBI double as Oakland maintained its American League wild-card lead with its 11th win in 14 games.
Anderson (4-0) limited Seattle to an unearned run and six hits as he struck out four without a walk. The left-hander has yielded a total of three runs over 26 innings in four starts since returning from Tommy John surgery.
The Athletics got on the board in the opening inning when Josh Reddick raced home from first on third baseman Kyle Seager's fielding error. Seattle knotted the game in the second on an RBI groundout by Trayvon Robinson, but Oakland erupted in the fourth and tacked on a run in the ninth with Yoenis Cespedes' sacrifice fly.
Hisashi Iwakuma (6-4) had his four-game winning streak snapped as he surrendered five runs - four earned - and six hits in just 3 2/3 innings. The 31-year-old had yielded only three runs over his previous four starts.
Franklin Gutierrez, Jesus Montero and Michael Saunders had two hits apiece for the Mariners, who have lost three of four. Seattle has scored a total of 15 runs in its last seven contests.
GAME NOTEBOOK: Oakland RHP Brandon McCarthy, who underwent surgery Wednesday to repair a fractured skull and an epidural hemorrhage one day after being hit in the head by a line drive, was alert Saturday as he was posting messages on his Twitter account. McCarthy reportedly is stable and progressing well, but still is listed in serious condition. ... Mariners rookie Erasmo Ramirez will start Tuesday at Toronto, and Hector Noesi also will take a turn in the rotation soon as manager Eric Wedge wants to see what his young starters can do.