Houston Astros season takes a hit on the mound as Brandon Walter and John Rooney head to season-ending elbow surgeries. Walter went 3.35 ERA over nine starts; Rooney debuted Aug 24 after a cash deal with Miami. Spencer Arrighetti will seek a second opinion and won’t return this season; Josh Hader rehabs a shoulder capsule sprain and isn’t throwing yet. Fantasy spin: bullpen roles and late-season saves will be in flux as Houston navigates the injuries.