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"Show me some other sub-88mph pitcher who throws all fastballs and does great."
George Sherrill throws 65-70% fastballs at 88-89 MPH. He couldn't get anybody to buy in for a while either, though it looks like Royce is working a little bit below George's level in both velocity and results.
Deception and evil sink on the ball can work wonders, but I don't know that Royce has that going for him. I don't mind finding out in the spring though.
~G