HOUSTON -- Lance Berkman greeted his teammates before Tuesday's series opener at Minute Maid Park. Berkman has been rehabbing in Houston following knee surgery on May 25 to repair a partial tear in the medial meniscus of his right knee.

Berkman went from player to player with back-slaps and handshakes, welcoming in his teammates to the Cardinals' clubhouse.

Walking normally, with no signs of ill-effects from his arthroscopic surgery, Berkman is expected to remain sidelined for 8-10 weeks.

"Walking up stairs and some other things," Berkman said of his continuing rehab. "Just working to get back."

Matheny keeping close eye on Draft

HOUSTON -- Cardinals manager Mike Matheny met in his office with the media prior to Tuesday's series opener with the Astros. He kept one eye on an inquiring media and the other on one of three laptops situated strategically on his desk.

That was the one giving him streaming play-by-play of the 2012 First-Year Player Draft. Matheny was not only keeping a close watch on the players the Cardinals plucked from the pot, but he was also anxious to find any news on the possible Draft status of his oldest son Tate.

"No news yet," Matheny said about three hours before Tuesday's 7:05 p.m. CT start.

But as Matheny pointed out, his son can't lose. He has a college scholarship waiting at Missouri State, should the Draft not go the way he hopes.

Tate Matheny is a talented center fielder who just recently completed his senior season at Westminster Christian Academy (Mo.).

"It's all his decision," the Cardinals manager said in reference to the possibility of his son bypassing college if drafted high enough. "I've been impressed with his maturity in that process."

Worth noting

• Both Carlos Beltran and Yadier Molina were given the night off on Tuesday by Matheny. Allen Craig played right field while Matt Adams got the start at first base. Tony Cruz was in the lineup behind the plate.

• Two Cardinals were among the leaders in the first All-Star Ballot update released Tuesday. Yadier Molina (1,100,048), three-time National League All-Star, was leading all catchers. Six-time All-Star Carlos Beltran (1,212,030), who entered Tuesday tops in the NL with 15 home runs, was second among all outfielders behind the Dodgers' Matt Kemp, who paced the league with 1,952,910 votes.

• Weekly updates will be announced each Monday (American League) and Tuesday (NL) throughout June. The 83rd All-Star Game will be played Tuesday, July 10, at Kauffman Stadium in Kansas City.