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Caution about +2 mph more or less, once a fastball is minus.
If a FB is minus, it's minus. That means the hitter can sit "in between" pitches and still have plenty of time to crank a FB.
Moyer had as good a command as anybody who's ever pitched. That 85 mph was right on the black, either black, and an 85 FB on the black is a plus pitch.