SEATTLE -- The Red Sox traded for Minor League catcher Guillermo Quiroz on Tuesday, sending cash considerations to the Mariners in return. Quiroz was with the Sox on Tuesday for the second contest of a three-game set at Safeco Field.

Quiroz, who spent the entire season with Triple-A Tacoma, hit .278 with 15 home runs and 52 RBIs in 89 games. He spent last season in the Padres' organization after appearing in six games at the Major League level with the Mariners from 2009-10.

"It was just crazy man, I wasn't expecting a trade to happen, to be honest with you," said Quiroz, who found out during Tacoma's game in Fresno on Monday and was preparing to head home to his native Venezuela.

He becomes the third catcher on the Boston roster, along with Ryan Lavarnway and Jarrod Saltalamacchia, although both Lavarnway and Saltalamacchia have been used at designated hitter at times.

"To have three catchers on a roster is always a good thing, especially when we're trying to play two of them at a time," manager Bobby Valentine said. "[Quiroz will] be ready to go if in fact we need that third catcher."

The 30-year-old Quiroz has played in 101 games during parts of seven Major League seasons with the Blue Jays, Mariners, Rangers and Orioles. He played a career-high 56 contests while with the Orioles in 2008, hitting .187 with a pair of home runs and 14 RBIs in 149 at-bats. In 255 career at-bats, Quiroz is hitting .208 with two home runs and 28 RBIs.

Quiroz hit .278 with 45 runs, 15 doubles and 15 home runs in 89 games for Tacoma this season and was named to the 2012 Pacific Coast League All-Star Team.

"I want to help this team win," he said. "I know it's been a rough year. I just come here to contribute. That's it.

"[I'm] a team player for sure. I want to help out the pitchers throw a lot of strikes, get outs and, of course, win ballgames."

Mortensen's wild ride continues with sixth callup

SEATTLE -- Clayton Mortensen's year of ping-ponging back and forth from the Red Sox to the Minors took another bizarre twist on Tuesday when he joined the big club in Seattle.

Not only is it his sixth callup to the Majors this season, it extended what has been a run of cross-country travel. This past week, the right-hander has gone from Boston to Los Angeles to New Hampshire to Portland, Maine to Seattle. In two days, he will head back to Boston with his Red Sox teammates to complete a whirlwind nine days.

Despite a season, and especially a week, of making an all-too-familiar trip from the Majors to the Minors -- he also pitched in a game at the Double-A level on Friday -- Mortensen said he's not letting it affect his mindset.

"The only time it would get difficult is if you let it get difficult," he said. "I knew going in this year that I was going to be a swing guy. I didn't know how many times I was going to be -- I believe I'm on number six right now -- but you can't let it get to you. If you let it affect the way you work and get after it, boy, you're sent down and when you come back up, you'll be unprepared.

Mortensen is 1-1 with a 2.25 ERA in 19 appearances out of the bullpen with the Red Sox this season. He has struck out 26 and walked 12 in 32 innings.

"Really never wanted him to leave," manager Bobby Valentine said. "Lot of things happened, it was a necessity for him to leave each time. I think the team kind of went south afterward, it seems, so hopefully we'll start heading north now that he's back."

Mortensen said he will take on what the team asks him to do, whether it be out of the bullpen or starting. And hopefully, that will translate into him being a part of Boston's future.

"I'd hope I've shown them I'm a hard worker. I'm a hard worker and I'm a competitor," he said. "I come out and I give 110 [percent] every time I take the mound. I hope they can see I'm a valuable asset. I don't know what they have in mind for going into next year, but hopefully I can be a piece of the puzzle next year. Hopefully, I've shown I'm capable of that."

Atchison's first rehab outing goes smoothly

SEATTLE -- Red Sox reliever Scott Atchison made the first appearance of his rehab assignment on Monday with Triple-A Pawtucket, throwing a quick and clean eight-pitch inning.

"Looked like he attacked the strike zone, had movement, got quick outs -- sounded like Atch to me," manager Bobby Valentine said. "Afterward, he had no pain. I'm glad that it looks like he's able to pitch."

Atchison is on the 60-day disabled list with a right elbow injury and hasn't pitched in the Majors since July 13. The right-hander is 2-1 with a 1.76 ERA in 37 games this season.

Worth noting

• Left-hander Franklin Morales, who is on the 15-day disabled list with left shoulder inflammation, played catch on Tuesday without any complications.

"He felt good, is pain free," manager Bobby Valentine said. "Going to start building him back up to game situation."

• Infielder Ivan De Jesus worked in the outfield before Tuesday's game. Valentine said De Jesus informed him that he can play the corners, but the first-year manager is unsure if he'll play him there.

• The Red Sox entered Tuesday having had 55 players appear in a game this season, tops in the Majors. They have only used 55 players once before, in 1996.