Astros DFA Shawn Dubin to clear room for AJ Blubaugh as Houston battles injuries in the rotation while chasing a series win vs Baltimore after being swept by Detroit. Dubin posted a strong season before an arm forearm issue that resurfaced post-return, prompting the roster shakeup. Blubaugh, a 25-year-old has MLB and Triple-A time and could slot into bullpen or spot start duty as Houston leans on fresh arms.