» A’S WEEKEND SURGE WINS BAY SERIES

OAKLAND — Matt Chapman ducked into the mob surrounding him, darting off the field as he tried to escape the emptying water bottles falling upon his head.

His high-bouncing ground ball evaded the trusty glove of Giants shortstop Brandon Crawford in the bottom of the 10th, bouncing into center field and allowing Marcus Semien to score with ease from second with two outs.

The A’s (57-43) walked off against their Bay Area foe for the second straight day in extra innings, this time for a 6-5 win that kept them within three games of the American League’s second wild-card berth.

Sean Manaea teased perfection on the mound again, surrendering the first 13 batters he faced. The left-hander only allowed two balls to leave the infield during his flawless first 4 1/3 innings, striking out four, inducing six groundouts, one infield popout and only two flyouts past the infield dirt.

Manaea encountered trouble in the fifth when Nick Hundley ended his perfect game bid with a single up the middle and Austin Slater doubled him home two batters later, but the A’s starter escaped further damage with a 3-1 lead after five frames.

Khris Davis and Matt Olson accounted for the hosts’ first three runs, Davis sending a Johnny Cueto changeup into the left-field seats for a two-run shot and his 22nd long ball in the first inning, and Olson annihilating a Cueto fastball into the right-field seats for the A’s third run and his 20th homer of the season in the fourth. Then again in the sixth, Olson tattooed a Cueto changeup just inside the right-field foul pole for his 21st homer of the season. Sunday marked the second time this season the first baseman has hit multiple home runs in a game.

Meanwhile on the mound, Manaea continued his recent string of efficient outings. After finishing his afternoon with 6 2/3 innings of two-run, four-hit ball, he now boasts nine straight starts in which he’s allowed three earned runs or fewer. He’s surrendered two earned runs or fewer in seven of those nine appearances. Manaea exited with two out in the seventh to a standing ovation, pounding his glove and pointing at catcher Jonathan Lucroy as he exited the field following his ninth straight start without a loss. He’s 4-0 during that span, dating back to June 5 against the Texas Rangers when he didn’t factor in the decision.

Manaea would’ve been 5-0 had it not been for the A’s bullpen wasting his start the same inning he departed. Manaea left Hundley on first, but Hundley later came around to score after Austin Slater singled off Emilio Pagan and pinch-hitter Pablo Sandoval roped a two-RBI double to the right-field wall off Lou Trivino. Trivino threw 24 pitches in 1 2/3 scoreless innings during an extra-inning win Saturday night but couldn’t preserve the A’s lead again a day later. The only run officially charged to him Sunday was the game-tying one that came on a bloop single by Alen Hanson, when pinch-runner Steven Duggar scored easily from second to knot the game at four.

For the first time this season, the A’s trotted out reliever Yusmeiro Petit for a third straight day. The decision backfired, and Andrew McCutchen took Petit deep to left on a full count with one out in the eighth to give the Giants a 5-4 lead. A day after the A’s blew a late lead only to win in 11 innings, the hosts did so again in the late stages on Sunday. Yet again, the A’s responded, this time courtesy of Davis’ second home run of the day, an opposite-field blast off Mark Melancon to tie the game at five in the eighth.

Jeurys Familia handled the top of the ninth in his A’s debut only four hours after he arrived at his new home ballpark for the first time. The former Mets closer hadn’t allowed a run since June 27, a stretch spanning seven appearances, and continued his hot streak Sunday. After allowing a leadoff single to Slater, Familia struck out Duggar swinging with a nasty slider and induced a 6-4-3 inningending double play off the bat of Hanson. He executed a 1-2-3 10th inning, too, showing one of the main reasons Oakland traded for him: provide a reliable late-inning option if All-Star closer Blake Treinen isn’t available (he threw 40 pitches and blew a save on Saturday).

Familia earned the win after Chapman’s walk-off, and the A’s headed to Texas coming off back-to-back series wins against their Bay Area rival.