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My dad must have taken me to see Clemens destroy the mid 80's to early 90's Mariners at least a dozen times. Before Randy Johnson, he was our "must see" pitcher.
Pedro's screwball changeup was a wonderful pitch, but his combination of command, deception, and unpredictability (the anti-League) is unmatched.
But Mo's cutter is probably the best single pitch I've ever seen. Everyone knew it was coming, but it just didn't matter.