This is behind a paywall, so I will try not to give too much away. Briefly, Zimmer looked great on Saturday night. Showed 3 pitches 60 or better (fast, curve, change). Sounds befuddled by his shitty results (5.65 ERA at a pitchers park in a pitchers league). I have heard the "delivery is too clean" theory but he didn't mention that, speculated maybe he was using his crappy slider too much or was rushing through his delivery creating inconsistent release points. I am kind of disappointed he saw him on a good night, I think watching him struggle would have been more telling.