SAN DIEGO — Drew Pomeranz found it no big deal to be back at Petco Park. He didn’t find a win, either.

The former Padres ace got outpitched by Edwin Jackson on Monday and the Boston Red Sox fell to San Diego 2-1.

“I had the most adrenaline when I was here the last time for the All-Star Game,” Pomeranz said. “I’m at the point where I’m just trying to get outs and it doesn’t matter where I’m at.”

Padres manager Andy Green saw a Pomeranz he remembered well.

“He looked exactly the same to me,” Green said. “He was good — flipping the curveball wherever he wants to.”

Pomeranz (2-4 for Boston) was an All-Star for the Padres this season and 8-7 in the NL before being traded to the Red Sox in mid-July.

“I think Drew gave us what we kind of anticipated — (105) pitches and six quality innings of work,” Boston manager John Farrell said.

Pomeranz gave up two runs and six hits in 5 2/3 innings. He struck out five with a walk.

A two-run homer by Adam Rosales was enough for Jackson and San Diego bullpen. Pomeranz said he missed on a fastball to Rosales.

“It just leaked back over the plate,” Pomeranz said. “I was having trouble locating my pitches and he took advantage of one.”

“It definitely wasn’t one of my best days,” he said. “I was struggling with my rhythm and timing and I had a hard time locating some of my pitches. I couldn’t get some big outs when I needed to.”

Jackson (4-5) struck out 11 in seven scoreless innings. He gave up four hits and ended his three-start losing streak.

Brandon Maurer worked the ninth for his eighth save in 13 chances. He gave up a one-out single to Hanley Ramirez, then struck out Jackie Bradley Jr. and got pinch hitter David Ortiz on a flyball.

Chris Young’s pinch-hit homer off reliever Brad Hand to open the eighth cut the Padres’ lead to 2-1.

Aaron Hill followed with a pinch-hit double but was stranded at third when Hand struck out Brock Holt and Xander Bogaerts.

Ramirez had three hits for Boston.

Boston’s best chance against Jackson came in the seventh. But with two on and none out, he got Bradley to ground into a double play and fanned Yoan Moncada on a full-count offspeed pitch.

“We got a couple of opportunities with really good hitters at the plate,” Farrell said. “But unfortunately we don’t execute to tie the game up.”

TRAINER’S ROOM

Red Sox: RHP Koji Uehara (strained pectoral muscle) was activated off the disabled list. He will be available on Tuesday, Farrell said.

Padres: CF Jon Jay (right forearm) will be added to the roster on Tuesday after playing in three minor league games. Jay missed 66 games.

UP NEXT

Red Sox: RHP Clay Buchholz (5-10, 5.20) gets the nod for the middle game of the three-game series. In his last three starts, he is 1-0 and has allowed just one run in two of them.

Padres: RHP Paul Clemens (2-4, 4.93) has set a career high with nine starts but his last one was rocky when he lasted by three innings, charged with two runs and four hits.