Roster moves!

So Brian McTaggart has the lowdown on three roster moves made last night:

-Tim Byrdak sent to the DL with a strained hamstring. Ed Wade:
"[Head athletic trainer] Nate Lucero called me after he came out of the game tonight and said Tim said he had trouble finishing his pitches, and Nate went back and looked at video of last year compared to this year and it was apparent to him he was really having trouble coming down on his landing leg. It seemed apparent he was trying to compensate for the hamstring."

-Astros purchase Gustavo Chacin's contract from Round Rock:
"I talked to [Round Rock manager] Marc Bombard and he said he Chacin could handle the role in the bullpen and [pitching coach Brad Arnsberg] is familiar with him from Spring Training and their days together in Toronto,"

Wade also explained that Wesley Wright was a candidate to come up, but that he pitched last night, so it wouldn't have made much sense. And it also wouldn't have made any sense, as Wright is being transitioned to a starting role, and Chacin is apparently headed to the bullpen.

-Astros option Gervacio to Round Rock, recall Wilton Lopez.