The 36-year-old Olerud is hitting .287 with three homers and 18 RBI in 49 games this season.
A veteran of 2,196 games with six teams, Olerud is a career .295 hitter with 251 homers and 1,211 RBI. He won a batting title as a member of the World Series champion Blue Jays in 1993, hitting .363 with 24 homers and 107 RBI.
Youkilis is hitting .288 with a homer and nine RBI in 35 games in four stints with the Red Sox this season.
He hit his second homer of the season in the fourth. But in the bottom of the inning, he had to stretch to take a feed for a possible double play from first baseman Derrek Lee. Garciaparra's throw to first was wide left and rolled into the camera well. He was charged with a two-base error as Chicago's lead was cut to 3-2. Garciaparra stayed in the field for the rest of the inning and then left the game.
Garciaparra played in 26 games after tearing his left groin running out of the batter's box in St. Louis on April 20. He has made 10 starts since returning Aug. 5.
Los Angeles Angels: Left fielder Garret Anderson was examined by Dr. Lewis Yocum, who ordered additional lab work. Anderson missed 43 games last season because of inflammatory arthritis in his upper back.
The team is sending him to rheumatologist David Brown, who diagnosed the illness in May 2004, the Los Angeles Times reported.
"The tests are to rule out some stuff," manager Mike Scioscia told the Times. "If he feels better and the symptoms leave, he'll be back in the lineup. The tests aren't going to impact when he returns."
Yocum took an MRI and a bone scan on the left hip of Angels rookie third baseman Dallas McPherson, who has been on the disabled list since July 8. The tests revealed irritation in the hip joint, and McPherson will be examined Wednesday by hip specialist Dr. Marc Philipon in Vail, Colo.
St. Louis Cardinals: The Cards' final season at Busch Stadium has produced record crowds and a first-place team.
The team announced Wednesday that it had sold 3.45 million tickets, breaking its single-season record of 3.43 million in 1989. The Cardinals' game Wednesday night against the Diamondbacks was expected to be the 31st sellout and 23rd straight
attendance over 40,000.
"We couldn't be more pleased with the support we've received from our fans," team president Mark Lamping said. "It's a record that everyone associated with the Cardinals should be proud of."
Through 61 games, the Cardinals were second in the National League in attendance at 2.63 million, trailing only the Dodgers' 2.73 million. The team projected crowds above 40,000 for its remaining 21 home dates and a total of 45 sellouts for the season.
Detroit recalled first baseman Carlos Pena from Triple-A Toledo to fill the roster spot.
Guillen's move is retroactive to Aug. 11. Doctors said the injury is not related to his ACL and that he could be back in a few weeks.
In 71 games with the Mud Hens, the 27-year-old Pena batted .311 with 17 doubles, 12 home runs and 45 RBI. His last game with the Tigers was against Baltimore on May 27.
Freel was injured when he jumped to try to catch a line drive Monday.
"I came down on it sideways," he told the Cincinnati Enquirer. "I didn't think it was anything. But I woke up [Tuesday] morning and couldn't walk."
The Reds purchased the contract of infielder Aaron Holbert from Triple-A Louisville. Holbert arrived in time to pinch-hit for Milton in the fifth and strike out.
Milwaukee Brewers: The team placed outfielder Brady Clark on the 15-day disabled list with a rib contusion and recalled outfielder Prince Fielder from Triple-A Nashville following Wednesday night's 2-0 victory over the Rockies.
Clark was placed on the DL retroactive to Aug. 11. He was injured against St. Louis when he collided with Hector Luna in a play at second base.
"Brady is seven days out and still four or five days away in the best-case scenario," manager Ned Yost said. "Going into Houston another left-handed bat off the bench will help us."
Fielder, the son of former major-league Cecil Fielder, will join the team in Houston. He was 9-for-28 with one homer and six RBI in 13 games with the Brewers from June 13 to July 3.
Information from The Associated Press was used in this report.