The A's have been, and will continue to be, busy around the edges of their roster since the last update here. In no particular order:
Edward Mujica took a batted ball off his hand, broke his thumb (apparently mildly, though tell that to Mujica's thumb), and somehow made a play on the ball to get the out before being removed from the game and basically sent straight to the disabled list. Arnold Leon had already come to the roster in place of the injured Drew Pomeranz, presumably on a short-term assignment until Pomeranz's slot in the rotation came up again and the A's brought up Kendall Graveman to make the start and sent Leon back down.