PHOENIX -- Two days after the D-backs claimed him off waivers from the Orioles, right-handed pitcher Brad Bergesen reported to Chase Field on Sunday and will take the role of the long reliever, as the club optioned Bryan Shaw to Triple-A Reno.

Baltimore recalled Bergesen from Triple-A Norfolk on July 17, but he never appeared in a game for the team this season. The Orioles drafted him in the fourth round of the 2004 First-Year Player Draft.

"It was at the point where it was perfect timing to get a fresh start," Bergesen said. "I'm really looking forward to it. Baltimore was the only other organization I had been with, so there definitely is a bit of nervousness, but it's a good nervousness. I'm just trying to meet everyone and learn the ways here."

In parts of three seasons with the Orioles, from 2009-11, Bergesen went 17-24 with a 4.68 ERA in 83 games. Although 59 of his career appearances have been starts, the D-backs need the 26-year-old in the bullpen after their previous long relief man, Josh Collmenter, moved back to the rotation.

"That's the plan, he'll be our long guy," D-backs manager Kirk Gibson said. "He's flexible like that though."

In 24 career relief outings, Bergesen owns a 5.36 ERA. He mostly works as a ground-ball pitcher, which figures to work to his advantage in the fly-ball friendly confines of Chase Field.

"I'm a contact guy, that's kind of my game," Bergesen said. "I'm looking forward to getting going."

Now on a team that has played in the postseason as recently as last season, Bergesen is anxious to contribute in whatever way he can.

"I watched these guys last year and know what this team is about, I want to be a part of it," Bergesen said. "Whatever the ball club needs from me, I'm happy with the opportunity."

Gibson gives Upton a rare breather on Sunday

PHOENIX -- D-backs outfielder Justin Upton was out of the lineup on Sunday for the first time since June 6. Currently in the midst of playing 20 games without a day off, D-backs manager Kirk Gibson wanted to give Upton a breather.

"It's not that I want to take him out of the lineup, just need to do it," Gibson said. "He's got to have a day off, and all our guys are playing well, so it's a good time to rotate them in."

Gerardo Parra got the start in right field against the Astros on Sunday.

With the D-backs set to face three straight lefties during their next series with the Rockies, Gibson said that Sunday made the most sense to give Upton the rest. The right-handed outfielder boasts an on-base percentage of .398 against lefties, more than 50 points higher than versus righties.

"He's obviously going to play all three days," Gibson said.

Reliever Shaw sent back to Triple-A

PHOENIX -- Ater allowing seven runs (five earned) in 1 1/3 innings of work over his previous two games, D-backs relief pitcher Bryan Shaw was optioned to Triple-A Reno on Sunday. The 24-year-old was disappointed when he heard the news, but knew his results warranted the change.

"I wasn't performing the way I need to perform, so it's the move they wanted to make," Shaw said. "The last few outings, it's been a little worse than rough. I have to go back down there and get my confidence back to where it needs to be."

After allowing just one run in 11 1/3 innings in June, the right-hander has taken a beating this month, surrendering 10 runs (eight earned) over six innings.

"A lot of guys go through rough patches, I hadn't gone through one, but I have to get back on track and find my way through," Shaw said. "Up until now everything has been going smooth. I hit the rough patch now and I have to get back to where I was."

D-backs manager Kirk Gibson noticed Shaw was attacking hitters differently, which was the difference in his spiraling results.

"He's kind of turned into a one-pitch pitcher right now, guys have made adjustments to him," Gibson said. "He'll have to mix it up and throw to both sides of the plate and up and down. He was just kind of aiming the ball and mostly every pitch was a cutter. He'll be fine though."

Over parts of two seasons with the D-backs, Shaw had a 3.53 ERA while opponents batted .278 against him.