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SAN FRANCISCO – Jarrett Parker crossed first base with his arms outstretched in a safe call, and the Giants spilled out of the dugout and onto the field at AT&T Park. Perhaps they were as stunned to win as the Diamondbacks must have been to lose.

In falling 5-4 in 10 innings on Saturday night, the Diamondbacks managed to lose a game they seemed all but assured of winning. They led 4-0 entering the bottom of the seventh inning, and right-hander Taijuan Walker had handcuffed a Giants lineup that had looked feeble against Diamondbacks pitching through the first 15 innings of this series.

BOX SCORE: Giants 5, Diamondbacks 4 (10)

The Giants scored three times in the seventh off Walker, tied it in the eighth and won it in the 10th, and though there were a litany of reasons why the game unraveled on the Diamondbacks, it didn’t seem to make it any less surprising that their three-game win streak came to an end.

“It was one of those games where we kind of did have control, and it got away from us a little bit,” reliever T.J. McFarland said. “We’ll have to get past it, move past it and come back tomorrow and pick up where we left off the day before.”

Walker, his pitch count at 98 after six innings, suddenly lost velocity and command when the seventh inning began. Manager Torey Lovullo said he was hoping to give Walker four more batters. He only got to three, and each of them scored.

Pablo Sandoval rifled a double into the left-center field gap for his first hit since rejoining his old team. Parker followed with an RBI double to right, giving the Giants their first run of the game. That set up a Walker-Hunter Pence matchup.

Walker had handled him well in each of the first two at-bats, but in the seventh Pence yanked a 1-1 pitch into the seats in left field for a two-run homer. A seemingly comfortable lead suddenly was down to one.

“We made a mistake pitching to Hunter Pence,” Lovullo said. “There’s a big, red ‘X’ about certain things you shouldn’t do. Unfortunately, we didn’t execute properly and he took advantage of it.”

Lovullo wasn’t specific, but the pitch Pence hit was a curveball down in the zone, the third consecutive breaking ball Walker threw him to start the at-bat. Walker defended the selection, saying Pence appeared out in front of the first one he saw in the at-bat.

“It’s 1-1 there, maybe he was sitting fastball after we threw two offspeed,” Walker said. “Maybe if I get it down more, maybe it’s a ground ball. But I left it up and he made me pay for it.”

It didn’t take long for the Giants to finish the job. Buster Posey’s double-play ball scored the tying run in the eighth, and Denard Span set the stage for Parker’s game-winning infield single by doubling off McFarland to open the 10th.

Just like that, the Diamondbacks had a night filled with regrets. Their weeks-long issue with runners position surfaced again; they went just 2 for 16 in those spots, and they could legitimately count six different innings in which they failed to scratch across a run or could have scored more than they did.

“We just couldn’t get that big hit at the right time,” Lovullo said. “I know there were a number of men left on in scoring position and obviously that’s the name of the game. … We didn’t do enough right.”

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Reach Piecoro at (602) 444-8680 or [email protected] Follow him on Twitter @nickpiecoro.

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Sunday’s game

Diamondbacks at Giants

When: 1:05 p.m.

Where: AT&T Park, San Francisco

Pitchers: Diamondbacks LHP Patrick Corbin (8-10, 4.77) vs. Giants RHP Jeff Samardzija (6-11, 4.77).

TV/Radio: FSAZ/KMVP-FM (98.7), KHOV-FM (105.1).

Corbin was roughed up by the Cubs on Tuesday at Wrigley Field, giving up eight runs (seven earned) in three innings. The Cubs connected for three home runs off him. … He had a prolonged stretch of success prior to that, posting a 2.83 ERA in eight starts. … He faced the Giants just once this season, giving up three runs (two earned) in four innings in his first outing of the season. … Samardzija has thrown well in his past two starts, allowing four earned runs in 15 innings, holding opponents to a .524 OPS against. … He faced the Diamondbacks in each of his first two starts of the season, getting hit hard (six runs in 5 1/3 innings) in the first one and posting better results (three runs in 6 2/3 innings) the next time. … 3B Jake Lamb has great numbers against Samardzija, going 5 for 11 (.455) with two doubles, one triple, one homer and four walks.

Coming up

Monday: Off.

Tuesday: At Chase Field, 6:40 p.m., Diamondbacks RHP Zack Godley (5-4, 2.86) vs. Dodgers RHP Kenta Maeda (10-4, 3.79).

Wednesday: At Chase Field, 6:40 p.m., Diamondbacks RHP Zack Greinke (13-4, 3.10) vs. Dodgers LHP Alex Wood (13-1, 2.33).

Thursday: At Chase Field, 6:40 p.m., Diamondbacks LHP Anthony Banda (1-1, 3.86) vs. Dodgers RHP Yu Darvish (7-9, 3.81).