OAKLAND -- A nightmare season for Conor Jackson took another bad turn on Friday, as he was placed on the 15-day disabled list with what's believed to be a sports hernia. In a corresponding move, the A's promoted Jeff Larish from Triple-A Sacramento for the second time this year.

"It's definitely a mental blow," Jackson said. "It's borderline embarrassing, just because I come over to a new organization and I've only played [18] games. I know that they had high regards for me coming over here and I felt like health has ridden my performance. It's just frustrating, that's not even the word I'm looking for."

Jackson said he's felt discomfort in his lower abdomen and groin since March and that he hoped to play through the pain this season. But during his first at-bat of Thursday's 4-3 win over the Rays, Jackson said he aggravated the injury and that he could barely get out of bed on Friday.

Jackson has seen three or four doctors regarding the injury dating back to his time with the D-backs earlier this season, but the A's hadn't yet diagnosed the injury before Friday's game.

Jackson said surgery is "the route we're looking at" and that recovery time for such a surgery usually runs four to six weeks. The A's have roughly six weeks remaining in the season. Jackson said he will meet Philadelphia-based Dr. William Meyers, who is renowned for diagnosing sports hernias, on Sunday.

"It's just hard to come in here and face your teammates and not be able to go out on the field and play with them," Jackson said. "I grew up a baseball player and it's tough watching. ... You've got to draw the line somewhere."

Jackson said teammate Travis Buck underwent a similar surgical procedure and that Buck was out for four to six weeks.

Jackson has missed 55 games this season due to a strained right hamstring, 37 with Oakland and 18 with Arizona. He said he believes his current abdominal injury may have led to his hamstring strains.

"Luck has not been on his side this year," manager Bob Geren said. "I feel bad for him because he's such a good player, but hopefully he'll be back there soon."

With Larish, the A's get a player who can play first and third base. It also means top power-hitting prospect Chris Carter will remain in Sacramento for the time being.

Blevins reflects on first career save vs. Rays

OAKLAND -- Though it was familiar territory for Jerry Blevins, he left with an unfamiliar result.

A day after he gave up a two-run single and blew a save on Wednesday against the Blue Jays, Blevins on Thursday picked up his first career save against the Rays in a 4-3 win.

"[Wednesday] I gave up a couple of runs to blow a save there actually, but I always have confidence in myself," Blevins said. "[A's catcher Kurt] Suzuki, when he comes out there, he's like, 'These guys got nothing on you, let's just go out there and get 'em.' And then when you get a nod of confidence from the skip, it's always nice."

With Andrew Bailey, Michael Wuertz and Craig Breslow unavailable Thursday, Oakland manager Bob Geren turned to Blevins, a 26-year-old southpaw. In 53 games this season, Blevins has a 3.86 ERA. Over his past 22 outings, Blevins has posted 19 scoreless appearances and a 2.35 ERA.

Along with Texas' 4-0 loss at Baltimore Thursday, Blevins' save helped move the A's into a tie with the Angels, seven games behind first-place Texas in the American League West.

"That's huge," Blevins said. "I feel our momentum's been kind of down, but now we win these three in a row, so it's a good run. We're trying to stay in the race and now we're making a push to get in first place again. We always peek at the scoreboard. We're not really looking at numbers, we just know that we're within arm's reach."

Bailey struggles in first rehab outing

OAKLAND -- Andrew Bailey's first career Triple-A game didn't exactly produce the best results, but the A's are only worried about how their closer came out of the outing.

Bailey, nursing a right intercostal strain, allowed two runs on three hits while walking none and striking out one in just two-thirds of an inning for the River Cats. He used 18 pitches -- as part of a pitch restriction -- and faced five batters.

The A's are likely to see how Bailey feels Saturday to determine if he'll need another rehab outing before being activated from the disabled list, where he's been sitting since July 30.

"I felt good," Bailey said Friday via text to MLB.com. "I have to talk with the trainers and coaches and will know more tomorrow."

The Oakland righty, enduring his first career stint on the disabled list, hasn't pitched in a game since July 20. Before that time, he hadn't allowed a run in 13 of his past 15 appearances.

Friday's stint marked Bailey's first with Sacramento, as he made the rare jump from Double-A to the Majors last year.

Worth noting

Matt Watson was seen packing his bags following Friday's game, and he told MLB.com he's heading on a rehab assignment Saturday with Triple-A Sacramento. That's good news for the A's outfielder, who wasn't expected to be ready for the rehab stint until Monday or Tuesday. Watson underwent surgery Aug. 9 to remove a kidney stone, and he's now taking part in all baseball activity. ... Coco Crisp has hit safely in 12 of his past 13 games and is batting .412 over that span. ... Cliff Pennington garnered his 20th stolen base of the season Friday, making him the first A's shortstop to have 20 steals in a season since Alfredo Griffin had 26 in 1987. Crisp also got his 20th stolen base, giving the A's three players with 20 steals. Rajai Davis has 36.