SAN FRANCISCO -- May 19 has materialized as the earliest possible date for Giants second baseman Freddy Sanchez to be activated from the 15-day disabled list.

Giants manager Bruce Bochy said Wednesday that Sanchez, who's on a rehabilitation assignment in the Minor Leagues to test his recovery from left shoulder surgery, will remain with high-Class A San Jose through Friday. Then Sanchez will join Triple-A Fresno for a series at Oklahoma City Saturday through Tuesday.

At that point, the Giants will evaluate Sanchez's progress. Bochy said that they won't necessarily rush him back into the lineup to compensate for the likes of Mark DeRosa (left wrist) or Edgar Renteria (right groin), if they remain absent. San Francisco is willing to wait until Sanchez is physically prepared to play regularly.

"When he comes up here, we're not bringing him up to play him a day and rest him a day," Bochy said of Sanchez. "There will be no restrictions."

DeRosa left AT&T Park in mid-afternoon to have more medical tests performed on his ailing wrist. Though the Giants would prefer to rest him over the next couple of days to give the numbness in his left hand's ring and little fingers a chance to subside, DeRosa has offered his services off the bench as a pinch-hitter or defensive replacement.

"He has expressed his desire to be used if we want to use him," Bochy said.

Bochy keeping rotation in order

SAN FRANCISCO -- Presented with the possibility of advancing Tim Lincecum's next turn in the starting rotation by one day, Giants manager Bruce Bochy indicated Wednesday that he won't change the club's pitching sequence at all.

"We're leaning more toward not moving him up and keeping him where he is," Bochy said.

This means that Todd Wellemeyer will pitch Friday night's series opener against Houston, followed by Lincecum on Saturday, when he'll oppose Astros ace Roy Oswalt.

Due to Monday's scheduled off-day, Lincecum will receive an extra day's rest -- which might not be such a bad idea, since he threw 116 pitches in six innings on Sunday in New York.

But Bochy said that didn't influence his decision. He simply felt no need to disrupt things.

"I like the way it's been going," he said, referring to the rotation that entered Wednesday ranked third in the National League with a 2.89 ERA.

Lincecum was the only Giants arm among the top four starters who was subject to being moved up, since he pitched immediately before the off-day. Had Lincecum been moved to Friday, Wellemeyer would have pitched Saturday so Barry Zito, Matt Cain and Jonathan Sanchez could get their regular rest.

Runzler's adjustment pays dividends

SAN FRANCISCO -- Dan Runzler needed only one outing to regain his effectiveness.

Runzler struck out two and induced a double-play grounder in 1 1/3 innings against San Diego on Tuesday, one game after he struggled against the New York Mets (one hit allowed, two walks and three runs yielded in one-third of an inning).

Watching videotape with pitching coach Dave Righetti and fellow left-hander Jeremy Affeldt helped Runzler realize that he was rushing his delivery.

"You kind of tense up," Runzler said. "Or you just want to make a pitch so bad that you say, 'Get to the plate, get to the plate,' instead of being smooth."

Citing the importance of maintaining tempo, Runzler concluded, "What I need to do a better job of is getting back to it on my own instead of having the outing snowball on me. It was a learning experience. That's the best part about relieving. You can go out there the next day. ... Sometimes just a minor adjustment will mean big things on the mound."