Dustin Pedroia shining through the gloom

OAKLAND, Calif. — At least Dustin Pedroia is showing up.

As the Red Sox hit what seems like a new low every day, their second baseman is playing some of his best baseball of the season. Pedroia was 3 for 4 with a double in Sunday’s 6-2 loss against Oakland.

Pedroia has hit safely in 13 straight games at 20 of 54 (.370) with eight extra-base hits and eight RBIs. He also has hits in 26 of his last 27 games, hitting .373 with 17 extra-base hits, 20 runs, and 16 RBIs.

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“I’m impressed every day I’ve seen since the first day of the season,” manager Bobby Valentine said. “There’s nothing like him. He’s a very special player.”

Pedroia is 9 of 22 in six games on the trip. The rest of the team is 37 of 177 (.209).

“I’m just playing the game,” Pedroia said. “Whatever situation is going on during the game, you just try to find a way to help us win. That’s all you can do. Everyone’s trying the best they can. But we have to play better.”

Pedroia also is shining on defense. He ranged behind second base in the seventh inning and made an off-balance throw to take a hit away from Josh Donaldson.

In the ninth, with the Sox trailing, 6-1, Pedroia slid into second headfirst for a double, and scored on a sacrifice fly.

Ellsbury sits

Center fielder Jacoby Ellsbury missed the game with a sore right wrist. He is 4 of 20 on the road trip.

“His wrist has been barking on him a little,” Valentine said. “When he set off on the road trip, the training room was hoping that one of these days would work [for a day off]. We’ll see if we can get him feeling a little better.”

Ellsbury has hit .267 with two home runs in 221 at-bats this season. He hit 32 homers in 660 at-bats last season.

De Jesus arrives

The Sox called up infielder Ivan De Jesus Jr. from Triple A Pawtucket to provide insurance in the event Pedroia leaves the team for the birth of his second child back in Boston.

De Jesus arrived at Oakland Coliseum just before game time and was given No. 56. He is the 54th player to be put on the roster this season.

De Jesus was one of the five prospects acquired from the Dodgers Aug. 25. The 25-year-old was 10 for 26 in seven games for Pawtucket.

DeJesus is primarily a second baseman but has experience at shortstop, third, left field, and right field. He is a career .298 hitter in the minors.

Back at it

Reliever Scott Atchison, who went on the disabled list July 14 with an elbow injury, will start a rehab assignment with Pawtucket on Monday.

The 36-year-old has a torn ulnar collateral ligament but was advised to rest and rehab instead of having surgery.

Atchison is hoping to pitch in a few major league games before the end of the season to determine whether he will try to play next season.

A bit one-sided

The Athletics won the season series, 8-1, and beat the Sox in the last eight games. It’s their longest win streak against the Sox since the Philadelphia A’s won eight straight in 1932 . . . Outfielder Ryan Kalish, who hasn’t had an at-bat since Wednesday, has a sore left shoulder. He is capable of playing the field or pinch running but it could be a few days before he is cleared to hit . . . Alfredo Aceves did not pitch on Sunday. He had appeared in four of the previous five games, throwing 143 pitches over 7 innings. Valentine’s aim is to prepare Aceves for a start or two before the end of the season . . . Jose Iglesias was 0 for 2 with a walk. He is 0 for 14 in five games since being called up . . . Pedro Ciriaco started in left field for the first time in his career and handled everything that came his way . . . Daniel Nava, who is on the DL with a sprained left wrist, likely will have surgery after the season.