Astros recalled RHP David Carpenter from Triple-A Oklahoma City. He'll take the place of Brian Esposito on the active roster. Carpenter, who was acquired from the Cardinals last August in the Pedro Feliz trade, has a 1.91 ERA at the minor league level this season, including a perfect 0.00 ERA and 21/6 K/BB ratio over 19 innings with Triple-A Oklahoma City. The 25-year-old right-hander is worth monitoring in this bullpen.