It was a comeback victory and a series win that came with a cost. Like an impulsive credit card shopping spree, the overall extent of the damage might not be felt for a few days. The Mariners used a five-run eighth inning to rally for a 9-6 triumph over the Braves on Wednesday night in a game they seemed intent on letting slip away. But the celebration was tampered with the possibility of two key players not being available to play in the big three-game series vs. the Yankees, starting on Friday in the Bronx. Second baseman Robinson Cano and outfielder Guillermo Heredia weren’t part of the late-inning fun. Both players were forced out due to injuries.