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IMHO, Medina was the choice there because the situation was relatively "easy" and the As had some righties coming up. The righties thing would have normally invoked a Capps sighting, but it was a 4-run "save" so why not save the arm in case we need it and get Medina in there? Perez would have come into the game if the batting order had gotten around to a lefty with the tying run at the plate. I really do believe he's going match-up to match-up and Perez will get a lot of work because line-ups frequently center on lefty lead-off men and lefty sluggers. But we shall see. Iwakuma today...good chance to sweep the evil As. :)