LOS ANGELES — They turned back the clock Friday night at Dodger Stadium.

They didn’t turn it back very far – just to the six-week stretch of July and August they thought they had put in the rear-view mirror with this week’s four-game winning streak.

But the offense reverted to its midseason malaise, managing just three hits while striking out 10 times in a 3-0 loss to the Arizona Diamondbacks that ended that winning streak – during which they scored 26 runs and hit nine home runs.

The second-place San Diego Padres also lost at Minnesota on Friday, so the Dodgers’ lead in the National League West remains two games.

“This was the first one in a while, I think in a week, that we’ve seen sort of a lackluster performance,” Dodgers manager Dave Roberts said. “I don’t know if it was coming off the off day or what. But obviously you’ve got to give credit to (Zac) Gallen, too.

“It was one of those nights that I just didn’t see the at-bats that we’ve been seeing the last week.”

Diamondbacks starter Zac Gallen became the third starting pitcher in the past seven games to drag a 5.00-plus ERA into a start against the Dodgers and dominate them for six innings. Yu Darvish (5.36) and Nestor Cortes (5.87) each held the Dodgers to one hit over six innings last weekend in San Diego.

Gallen came into Friday’s start with a 5.13 ERA over his first 27 starts this season for a Diamondbacks team that was supposed to ride its pitching into contention but held the Dodgers scoreless on two hits in six innings.

“He’s been a good pitcher for a long time. Tonight he was good,” Roberts said. “I think he was going with a lot of sinkers in on our guys. Changing speeds. We just obviously couldn’t figure anything out tonight.

“We just really couldn’t put anything together all night long. For me, I think we just got to wash this one and focus on Rodriguez tomorrow.”

The Diamondbacks’ starters the next two days – Eduardo Rodriguez (5.67) on Saturday and Brandon Pfaadt (5.13) on Sunday – also have ERA’s over 5.00.

But even in Gallen’s good years, he has struggled against the Dodgers. Friday was his first win in eight career starts at Dodger Stadium and only his second in 15 career starts overall against the Dodgers.

He walked the first batter in each of the first two innings Friday but got a double play to erase the first one and struck out the side following the walk in the second.

Gallen didn’t give up a hit until Shohei Ohtani’s ground ball off the glove of first baseman Tyler Locklear with two outs in the third. The Dodgers didn’t hit a ball out of the infield until Teoscar Hernandez flew out to end the fourth inning and didn’t get a runner to second base until Mookie Betts’ two-out double to left center in the sixth inning – their second and last hit off Gallen in his six innings. Will Smith flew out to the warning track in left field to strand Betts.

“I think he was using his fastball and hitting the corners. He put it in a spot that, basically, it’s hard to make good contact. It’s one of those days where he was pitching really good,” Hernandez said.

“He’s always the kind of pitcher that uses his fastball a lot. Before, maybe he was missing in the middle of the plate and we were taking advantage of it. But today he was hitting the corners. It was really hard to get to a good pitch and put it in play.”

The Diamondbacks were hardly lighting up the scoreboard against Dodgers starter Blake Snell either.

He also didn’t give up a hit until the fourth inning. But that Lourdes Gurriel Jr. single was followed two batters later by a two-run home run from Blaze Alexander.

“Bad pitch, down and in, just not a good pitch,” Snell said.

Both of those hits came on four-seam fastballs from Snell – 92.1 mph to Gurriel, 93.4 mph to Alexander. Snell’s fastball velocity was down in his first start back from paternity leave. He averaged 93.7 mph on his 26 four-seamers, down from a season average of 95.4 mph. None of his 15 swings-and-misses in 86 pitches came against his fastball.

“It’s been a weird week for him just having the baby and kind of trying to readjust and the throwing schedule, the sleep schedule, all that stuff,” Roberts said. “He just didn’t have a whole lot in the tank tonight.”

Snell left the team after his start in San Diego last weekend for the birth of his second child. He didn’t use the disruption as an excuse – nor did he mention being ill this week.

“I had a busy week, man. A lot going on,” he said. “I’m not worried about (the diminished velocity). I know what’s going on. So it’ll come back. I’m zero worried about it. I mean, I was aware of it. But I’m not gonna push it. It is what it is. It’s what I had today. Just gotta be better.”

Corbin Carroll led off the sixth inning with a double and scored two batters later on an RBI single by Gabriel Moreno.

The Dodgers’ offense didn’t stir from its slumber once Gallen gave way to the bullpen. They had just one hit over the final three innings – a two-out single by Andy Pages in the seventh inning.

“When the pitcher deserves the credit, you have to give it to him,” Hernandez said. “And it was one of those days.”