PHOENIX (AP) — Mike Leake still is looking for his first win as a San Francisco Giant.

His teammates didn’t give him much help at the plate, either.

Phil Gosselin and A.J. Pollock homered off the San Francisco right-hander and the Arizona Diamondbacks opened a three-game series Monday with a 6-1 victory over the Giants, their eighth loss in 10 games.

“We just couldn’t do anything offensively,” San Francisco manager Bruce Bochy said. “We had our chances but we’ve got to get some guys come through and deliver.”

Patrick Corbin, who missed all last season following Tommy John surgery, threw six scoreless innings for the Diamondbacks, who snapped a four-game losing streak.

“He has been throwing well the last couple of starts,” Bochy said. “His stuff is what it was before surgery. “

Corbin (5-3) scattered six hits, struck out five with no walks and had an RBI single.

Gosselin’s three-run shot was his second home run since being activated from the 60-day disabled list (fractured left thumb) eight days earlier.

Leake (9-8) allowed six runs and 11 hits in 5 2-3 innings to fall to 0-3 in his five starts since being acquired from Cincinnati.

“Mike was really good at times. He just made some mistakes,” Bochy said. “This is a park where the ball caries well and the one breaking ball for the three-run homer he just left up a bit.”

San Francisco fell nine games behind the first-place Los Angeles Dodgers in the NL West. The Giants are 1-4 in the games Leake has pitched.

“It just stinks,” Leake said, “because we are in the hunt and we are not winning when I pitch as much as I like. It is nothing to sulk over. You got to keep competing and hopefully we can pull some out.”

Gosselin, who also singled and scored, came to Arizona in the trade that sent Bronson Arroyo and 2014 first-round draft pick, 19-year-old right-hander Touki Toussaint, to Atlanta. His one-out homer in the second just cleared the wall next to the 413-foot sign in left center.

“He was a tough at-bat the whole day,” Leake said.

In the fourth, Corbin’s soft bases-loaded single to left brought in a run and Pollock’s sacrifice fly another, Gosselin’s left hand touching the plate just ahead of right fielder Marlon Byrd’s throw.

“He made a good throw,” Arizona manager Chip Hale said, “and if it wasn’t for the great slide, (Gosselin) would have been out.”

Pollock’s solo home run in the sixth ended Leake’s day.

Corbin escaped a jam in the fourth. Buster Posey’s ground-rule double and Byrd’s single put runners at second and third with no outs. Brandon Belt flied out to shallow center, Brandon Crawford struck out looking and Jackson Williams grounded out to third to end the inning. Crawford was 0 for 4 and has four hits in his last 42 at bats.

Joe Panik, just activated from the 15-day DL, led off the eighth with a double off Daniel Hudson over the head of Pollock in center and scored on Posey’s single. The Giants went on to get runners at first and second with one out but left them stranded. They were 2 for 11 with runners in scoring position.

PROUD POP

The Giants purchased the contract of RHP Brett Bochy from Triple-A Sacramento. The son of the manager is making his second big-league appearance. The reliever pitched in three games when the roster expanded last season.

The younger Bochy was 6-1 with a 2.95 ERA in 43 relief appearances with Sacramento.

His father called Brett’s call-up “very, very special.”

“I’m very proud of him,” the manager said. “... He’s earned it with the year he’s had.”

TRAINER’S ROOM

Giants: Panik had missed 34 games with lower back inflammation. ... Bochy said LHP reliever Jeremy Affeldt (left knee subluxation) would be activated from the DL on Tuesday.

Diamondbacks: LHP Andrew Chafin is to rejoin the team this week after being sent down to Triple-A Reno for rest. ... RHP Archie Bradley (right shoulder tendinitis) was to pitch in Reno’s season finale on Monday.

UP NEXT

Giants: Ryan Vogelsong (9-11, 4.98 ERA) was listed as the starter for Tuesday but pitched two innings of relief on Monday. After the game, Bochy said Tim Hudson (6-8, 4.69 ERA) would get the start instead.

Diamondbacks: Chase Anderson (6-5, 4.26 ERA) tries to give Arizona its first series win since sweeping four at Cincinnati Aug. 20-23.