OAKLAND (AP) -- Stephen Piscotty and Matt Chapman homered, Matt Olson had three hits and the Oakland Athletics defeated the Seattle Mariners 7-5 on Friday night.
Oakland pulled 1 1/2 games behind first-place Houston — which lost to the Los Angeles Angels — in the AL West, and extended its lead for the second wild card over Seattle to 5 1/2 games.
The A's have won 20 of their last 29 games and are 26-13 since the All-Star break.
The Mariners have lost four of their last five.
After squandering an early 5-0 lead, the A's scored the go-ahead run in the bottom of the fifth and then turned to their shutdown bullpen, which combined for 4 2/3 innings of scoreless relief after Mike Fiers was rocked in his shortest outing of the season.
Yusmeiro Petit (6-3) pitched 1 1/3 innings for the win.
Blake Treinen worked a scoreless ninth for his 34th save after Fernando Rodney, Lee Trivino and Jeurys Familia each pitched one inning.
Olson singled leading off the fifth and scored the go-ahead run on Ramon Laureano's sacrifice fly.
The A's extended their lead to 7-5 in the sixth when Khris Davis singled in Jed Lowrie.
Fiers gave up five runs in 3 1/3 innings in his worst start since coming to Oakland in a trade with the Tigers on Aug. 6.
Piscotty's 19th home run — a two-run shot to left off Mariners starter Mike Leake — highlighted a five-run first inning in which the A's sent nine men to the plate.
Chapman started the inning with his 22nd home run — a solo shot to left — and Olson had an RBI double.
Leake (8-9) gave up six runs and 11 hits with two walks in 4 1/3 innings. He lost his fourth straight decision and is winless in his last 11 starts.
The A's acquired RHP Cory Gearrin from the Texas Rangers. RHP Paul Blackburn was transferred to the 60-day disabled list to clear a spot on the 40-man roster.
The A's recalled outfielder Dustin Fowler from Triple-A Nashville on Friday. He was 0 for 5 in his first game back. ... Mariners RF Mitch Haniger extended his hitting streak to 12 games. ... The A's are 66-0 when leading after eight innings.
Mariners: SS Jean Segura was out of Friday's lineup with a deep bone bruise in his left shin. He suffered the injury fouling a ball off his leg on Wednesday in a game against San Diego. ... LHP Marco Gonzales (neck muscle strain) threw on flat ground for a second straight day on Friday, but it's not known when he'll throw a bullpen session, the next step in his recovery, manager Scott Servais said. Gonzales went on the DL Aug. 27, retroactive to Aug. 24.
Athletics: LHP Brett Anderson (left forearm strain) threw on flat ground on Friday.
Mariners LHP James Paxton (10-5, 3.68 ERA) will make his start since going on the DL with a left forearm contusion on Aug. 15. A's RHP Daniel Mengden (6-6, 4.28) is 0-2 with a 4.91 ERA in two career starts against Seattle.
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