HOUSTON -- Pittsburgh right-hander Ross Ohlendorf threw 22 pitches off a half mound three hours prior to Saturday's game at Minute Maid Park and is on schedule to throw a regular side session on Sunday.

Ohlendorf, who is on the 15-day disabled list with back spasms, threw fastballs and changeups on Saturday.

"It went well," said Ohlendorf, who said he felt no pain or soreness.

On Sunday, Ohlendorf will throw between 30-40 pitches on a full mound.

Ohlendorf (0-3, 3.60 ERA in one start) is eligible to come off the DL on Tuesday but will not be activated on that date. If everything goes well on Sunday, Ohlendorf, who went 11-10 with a 3.92 ERA last season in his first full season with Pittsburgh, will throw another side session in Milwaukee on Tuesday. That will consist of three sets of 15 pitches, separated by five-minute breaks.

"We'll see how his back reacts to the up and down, on and off," said Pirates pitching coach Joe Kerrigan. "[We need to] get him used to that before he goes out."

Before pitching for the Pirates, Ohlendorf will make a rehab start in the Minors.

"I would think it would be coming up quickly," said Ohlendorf.

Pirates deal Van Every to Red Sox

HOUSTON -- The Pirates made a trade on Saturday, sending Jonathan Van Every to the Boston Red Sox for a player to be named later.

Van Every was playing outfield for Triple-A Indianapolis. He previously played for the Red Sox in 2008 and '09.

Crosby, LaRoche return to lineup

HOUSTON -- Bobby Crosby and Andy LaRoche were in the Pirates' starting lineup on Saturday after both missed a short period of time with minor injuries. Crosby started at first base, batting second, and LaRoche started at third base, batting sixth.

Crosby missed four games due to inflammation in his left shoulder, and LaRoche left a game on April 16 due to back spasms.

Crosby has made starts at first, third and shortstop this season.

"I'm glad to have them back," said Pirates manager John Russell. "We missed them. Not only on the field, but knowing they're able to play adds another dimension to your club."

Jakubauskas makes first start for Pirates

HOUSTON -- Pirates starter Chris Jakubauskas was recalled from Indianapolis on Friday.

He was hit by Lance Berkman's comebacker in the first inning of his start on Saturday, leaving the game with a head injury. Jakubauskas was examined by the Astros' team physician and sent to Methodist Hospital, where he will spend the night under observation.

The 31-year-old right-hander was making his first start of the season with the Pirates. He is Pittsburgh's seventh different pitcher to start this year, joining Zach Duke, Ross Ohlendorf, Paul Maholm, Charlie Morton, Daniel McCutchen and Brian Burres.

In Jakubauskas' last start for Indianapolis on April 17, he allowed two runs in five innings with seven strikeouts in a 3-2 loss versus Toledo.

Jakubauskas spent a majority of the 2009 season with Seattle, compiling a 4-2 record with a 4.33 ERA.

Iwamura's low average misleading

HOUSTON -- Pirates leadoff hitter Aki Iwamura's low batting average is a bit misleading because the second baseman takes a lot of pitches and tries to force opposing pitchers to raise their pitch counts.

"You like a guy at the top of the order that will work the pitcher a bit and make him throw some pitches," said Pirates manager John Russell. "Iwamura does that, which is good."

Iwamura's nine walks are second on the team to right fielder Garrett Jones' 14. Iwamura has two home runs and seven RBIs.

"You know he's going to get hits, and he works the count," said Russell. "He's going to give you a professional at-bat."

Iwamura went 0-for-3 on Saturday, dropping his average to .194.