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3/24/2013 3:59 P.M. ET

Freiman excited for opportunity with A's

PHOENIX -- Nate Freiman has seven days to impress his third employer in the last four months, or else he's on the move again.

The 6-foot-8 Freiman, whom the A's claimed off waivers from the Astros on Saturday, was in A's camp Sunday morning and found his way into the lineup at designated hitter right away. He'll start at first base, where he has the chance to form a permanent platoon with Brandon Moss, on Monday.

"He'll get the whole game, both of them," manager Bob Melvin said. "We'll try to get him as many at-bats as we can without impeding the progression that we have with some of the guys in the DH spot. It's prudent that we take as hard of a look at him as we can, give him as many at-bats as we can."

Those at-bats will influence the A's to either keep him on their big league roster or place him on waivers and offer him back to San Diego, which exposed him to the Rule 5 Draft in December and subsequently lost him to the Astros.

"Quite the ride," Freiman said.

The 26-year-old was in Taiwan with fiancé Amanda, who became his wife in December, when he learned he'd been picked up by the Astros. On Sunday, he was playing in the second inning of a Grapefruit League game when Houston manager Bo Porter took him aside and told him he'd be packing his bags again -- this time to Phoenix to join the A's.

So Freiman got to go home and sleep in his own bed.

"I live 15 minutes from here," said Freiman, looking around at Phoenix Municipal Stadium. "This is incredibly exciting. I really appreciate the opportunity they've given me, and I look forward to making the best of it.

"This is a great organization to be in. With how they did last year, their track record, playing good baseball, I'm really excited to have a chance to compete for a spot on this team."

Freiman hasn't played above the Double-A level, but says he's "confident that I could be competitive" in the big leagues. He hit .298 last year at Double-A San Antonio with 24 home runs and 105 RBIs in 137 games.

"I don't think they would've gotten him at this point if they didn't think he had a chance [to make the team]," Melvin said.

If he makes it to Opening Day, Freiman will be used in much the same way Chris Carter was last year, complementing the left-handed Moss. Carter, coincidentally, landed with the Astros in the Jed Lowrie trade, and he's one of the reasons Houston no longer had a need for Freiman, who is learning not to get too comfortable anywhere.

"Yesterday, I was pretty sure I was going to be ending the day in Florida," he said. "Stuff happens. I'll take this day by day.

"Making the roster would be an incredible honor. I would be really grateful to the A's for the opportunity they've given me, and I would continue to work hard."

Jane Lee is a reporter for MLB.com. Read her blog, Major Lee-ague, and follow her on Twitter @JaneMLB. This story was not subject to the approval of Major League Baseball or its clubs.