Baseball players aren't robots.
You knew that already. It's not hard to think of players -- Luis Gonzalez, Melvin Mora, Roy Halladay -- who, with little or no warning, suddenly become a different sort of player. A better player. A slightly less rosy subject are the other sort of players, the ones who look like they've become a better player but, as it turns out, really haven't. Below are my nominations for the best examples of this phenomenon over the last five years.
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