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5/5/2014 7:28 P.M. ET

Cain goes on DL to avoid reopening cut

PITTSBURGH -- The Giants placed starter Matt Cain on the 15-day disabled list, retroactive to April 24, with a cut on his right index finger. To take Cain's spot on the roster, the Giants have called up Jake Dunning from Triple-A Fresno. Yusmeiro Petit started in Cain's place against the Pirates on Monday.

"The biggest thing was that it just wasn't fully healed," Cain said. "It would be taking a big risk to go out there and have a chance that it could break open and that it would end up causing worse damage. This way it could be a maximum probably two starts. I should be fine to go on Saturday."

Cain threw a bullpen on Friday with a covering over the cut on his finger. It was initially believed that Cain wouldn't need to go on the disabled list. Cain suffered the injury using a kitchen knife.

"I think we're all confident that he'll be OK to go on Saturday," Giants manager Bruce Bochy said. "This gives him a couple of extra days to make sure this thing heals up, so we don't have to maybe throw and reopen that cut. My guess is he'll be ready to go."

Petit made his second start of the season on Monday.

"Petit did a tremendous job his last time out," Cain stated. "He went six shutout innings. You never know, I might have to watch out. I'll be out in the bullpen and he'll be taking my spot.

Cain is winless in five starts, carrying a 4.35 ERA with a 25/10 K/BB ratio in 31 innings.

Dunning recalled to be long man in bullpen

PITTSBURGH -- Right-hander Jake Dunning joined the Giants on Monday, taking Matt Cain's spot on the roster after Cain was placed on the disabled list. Dunning, 25, has a 2.51 ERA in 14 1/3 innings with Triple-A Fresno, spanning one start and seven relief appearances.

"I just try to keep the same process," Dunning said. "Just keep the ball down, results are going to take care of themselves. I'm not too caught up in the numbers situation. I'm just trying to get guys out and execute pitches out there."

When Dunning was recalled last year it was in Pittsburgh, and he is happy to be back with the Giants.

"This is definitely the place to be," Dunning said. "It's a great feeling being here, and these guys in this clubhouse are amazing guys."

Dunning fit the Giants' needs at this time.

"He did start," Giants manager Bruce Bochy said. "That just increases his value and flexibility, and that was something we needed today, was somebody who could give us innings, a long guy. He's been throwing three-plus innings and so he's the perfect guy to replace Yusmeiro Petit, because that was his role."

Worth noting

• The Giants completed a three-game series sweep in Atlanta on Sunday. San Francisco went 0-for-13 with runners in scoring position during the weekend in Atlanta and became the first Major League team to sweep a series of three or more games without registering a hit with RISP since April 8-10, 1969, when the Padres, in the first series in the franchise's history, swept three games from the Astros while going hitless in 14 at-bats with runners in scoring position.

George Von Benko is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.