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I don't know if the M's are on that list. Did he enjoy his stay last time he was with the M's? I did hear he has lost a couple of miles on his fastball this year, but being left handed with great control not as big a deal as most pitchers who lose something on fastball. I still shake my head on the fact that the Mariners were able to trade for him in the first place with a really mediocre to poor package years ago. I wouldn't trade Walker because I don't think you'd have to. Prospects are more valuable these days, especially top, top ones.