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09/16/12 3:58 PM ET

Casilla dominating in revised bullpen role

PHOENIX -- Though Santiago Casilla surrendered a run Saturday night, it only underscored the effectiveness that the right-hander has sustained recently. The run ended Casilla's season-high, 14-inning scoreless streak, which spanned 13 appearances.

The deposed closer has surged instead of sagged since the Giants began preserving late-inning leads by committee, allowing two runs in his previous 20 innings entering Sunday. Moreover, with 65 appearances, Casilla has eclipsed his previous professional high of 57 in 2005, when he spent time in Double-A, Triple-A and Oakland.

Casilla appeared in his fourth consecutive game Saturday.

"I actually was thinking about staying away from [using] him, but he said he felt better than he did [Friday]," manager Bruce Bochy said.

Casilla has converted 24 of 30 save chances this year, but he hasn't received a save opportunity in his last 24 outings.

Sore shoulder to sideline Blanco briefly

PHOENIX -- Giants outfielder Gregor Blanco said Sunday that he'll probably miss at least two games due to soreness in his left shoulder that mysteriously developed.

Blanco related that he began feeling discomfort in the shoulder during Saturday night's eighth inning. He underwent no tests but was examined by team orthopedist Dr. Ken Akizuki. The 28-year-old didn't seem too concerned about his condition.

"I'll do some exercises and get it back together," said Blanco, who started San Francisco's previous seven games -- six in left field and one in center.

Justin Christian, who received his ninth start of the season, replaced Blanco in left field Sunday. An obvious alternative would have been Xavier Nady, but the condition of his left hamstring left Giants manager Bruce Bochy feeling leery.

"Nady's real close," Bochy said. "He's not quite 100 percent and I think we'd be putting him at some risk by starting him."

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.