OAKLAND -- Collecting relievers is becoming a serious hobby for these A's, who added yet another in a trade for Cory Gearrin on Friday.
Oakland sent Minor League pitchers Abdiel Mendoza and Teodoro Ortega to Texas to acquire the right-hander, who joins Jeurys Familia, Fernando Rodney and Shawn Kelley in a long line of in-season bullpen additions for a club that's been depleted of starting depth.
The A's entered play against the Mariners on Friday with nine relievers in tow; come Saturday, when rosters expand, Gearrin will be added to the roster, and he'll likely have company as they A's seek additional help from Triple-A.
Gearrin, added just before Friday's deadline to acquire players who will be eligible to join a postseason roster, had a 2.53 ERA and 0.89 WHIP in 21 appearances for the Rangers. Prior to his July 8 trade to Texas, he pitched to a 4.20 ERA in 35 outings for the Giants.

The 32-year-old is under team control through 2019.
"He's been terrific," A's manager Bob Melvin said. "You would envision more of a matchup righty-righty guy, but he's also shown the ability to get lefties out. He can pitch a couple innings, he's got a funky arm slot, the ball moves a lot.
"I know he's excited about being here. I talked to him for a while today. He says, 'I'll do whatever you ask me to do,' and I told him, we're probably going to do things a bit differently with how we use our bullpen."
Melvin has so many pieces in play that defined roles are reserved for a select handful. He's asking flexibility out of everyone else.
"It's exciting being able to go over there for a team that's been playing as hot as they have been," Gearrin told local Texas media following the trade. "To be able to go over there and be part of that bullpen, I feel like it's going to be something special. They've really been investing in their bullpen, so, I have an opportunity to go over there and be a part of something special there in the backend, or maybe in the front."
Fowler returns
The A's recalled outfielder Dustin Fowler on Friday, optioning right-hander Frankie Montas -- the losing pitcher in Thursday's opener against Seattle -- to Triple-A. Fowler was immediately back in the leadoff spot, but with center field occupied by Ramon Laureano, Fowler was placed in left.
"Obviously Laureano is killing it," Fowler said. " It's a tough lineup to break, so I'm happy to be in it."
Fowler was scuffling at the plate upon his Aug. 1 demotion, but he responded with a .379 average in 25 games with Nashville, counting off 10 doubles, three triples and a home run.
"Went down there and did exactly what we asked him to do," Melvin said.
"I felt like I was part of the guys, part of the team, so I wanted to be up here," Fowler said. "I had to do everything I could to get back in the lineup. Laureano was killing it. He did everything he had to do, and I knew I had to do a lot to get back up here. Now I just gotta do everything I can to stay in the lineup."

Worth noting
• Melvin said lefty Brett Anderson (forearm strain) was feeling well enough Friday to play catch, putting him ahead of schedule.
• Right-hander Andrew Triggs, who hasn't pitched since May 17 because of nerve irritation in his pitching arm, is set to throw in a simulated game with Class A Advanced Stockton on Saturday. Best-case scenario, Triggs said, he'll be available in relief at some point this month should the A's call on his services.
A member of the Opening Day rotation, Triggs was 3-1 with a 5.23 ERA in nine starts at the time of his injury.