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Don't know who they are yet...this isn't the type of asset I'd want to give anything too close to the big leagues in terms of prospects for...so...let's see who it is. But Phelps will definitely help the Mariner bullpen find some stability and take the pressure off of badly-overused options like Vincent and Pazos.
Supposedly, one of the minor leaguers is a center fielder and the other three are pitchers.
Dang...FOUR players for Phelps?