Astros general manager Jeff Lunhow said Wednesday that first baseman Jonathan Singleton is "on deck." Lunhow refused to disclose details, but noted that "when the time is right" Singleton will be promoted to Houston. The Super Two deadline is set to pass in early June. That's presumably when the time will be right. Singleton, 22, is batting .293/.401/.629 with 12 home runs and 34 RBI in 38 games this year at Triple-A.