The Astros have added reliever Joe Thatcher to the active roster on Tuesday. Thatcher was designated for assignment by the Astros at the end of July, and elected free agency rather than head to the minors.
But, a week later he inked a minior-league deal with the Astros, and had been pitching with Triple-A Fresno. In nine games with Fresno, he posted a 1.04 ERA.
To clear room on the 40-man roster, pitcher Jake Buchanan was designated for assignment.