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05/17/12 2:50 PM ET

Giants concerned about Surkamp's elbow

SAN FRANCISCO -- Giants manager Bruce Bochy said Thursday that left-hander Eric Surkamp has experienced an unspecified setback in his recovery from a strained throwing elbow, which is an ominous development for the club's pitching depth.

Asked if the 24-year-old Surkamp might need surgery, Bochy said only, "Obviously there's concern."

Surkamp, who spent most of last season at Double-A Richmond, showed promise in Spring Training, posting a 3-1 record with a 4.41 ERA in five Cactus League appearances. He struck out 14 batters and walked five in 16 1/3 innings, a considerable improvement over his six-game stint last September with the Giants (13 strikeouts and 17 walks in 26 2/3 innings).

Melky back in action; Arias still out

SAN FRANCISCO -- A partial day's rest for his ailing left foot was all that Giants left fielder Melky Cabrera needed to return to the starting lineup.

Cabrera was a late scratch Wednesday when an irritation similar to a corn, as manager Bruce Bochy described it, became excessively painful. Cabrera felt fit enough to pinch-hit in the eighth inning, though he grounded out to third base.

Cabrera, the only Giant to have appeared in every game this season, has a history of durability. He averaged 152 games per season from 2009 to 2011.

Infielder Joaquin Arias remained out of the lineup as he continued to mend his bruised left forearm. Arias tried hitting and fielding early Thursday morning, but Bochy decided to rest him for at least one more day.

"He's not quite ready," Bochy said. "He's still a little sore. He can't quite let the bat go."

Arias was injured Tuesday when he was hit by a pitch from Colorado's Jeremy Guthrie. He had started 15 of 19 games at that point.

Giants give Crawford shot at No. 2 spot

SAN FRANCISCO -- Brandon Crawford became the ninth different Giant to bat second as he occupied that spot for Thursday's game against the St. Louis Cardinals.

Though Crawford went 0-for-4 Wednesday, manager Bruce Bochy pointed out that he made solid contact twice.

"He actually has been swinging the bat pretty well lately," Bochy said.

Entering Thursday, San Francisco's No. 2 hitters ranked 13th in the National League in slugging percentage (.336) and 12th in batting average (.243), on-base percentage (.308) and OPS (on-base plus slugging percentage, .644). The Giants also had received one homer and 11 RBIs from their No. 2 hitters.

Freddy Sanchez was expected to solidify the second berth, but has remained sidelined while trying to overcome a dislocated right shoulder and, more recently, lower back stiffness.

"I'll continue to mix it up in that No. 2 hole until we find somebody we're comfortable with," Bochy said.

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