It is explained here and here.
The last game that we have Pitch F/x data from (from Brooks Baseball) is October 22, where Josh Stinson went 1 inning, giving up 1 hit, and striking out 1. Stinson is a 21 year old right hander who had a 1.98 ERA in Port St Lucie.
His Pitch F/x data:
Josh Stinson, 10/22/09 | ||||
Pitch Type | Avg Speed | Avg Pf_x(Horizontal Break) | Avg Pf_z (vertical break_ | |
Fastball (4 seam) | 91.07 | -6.41 | 7.94 | |
Changeup | 84.75 | -9.52 | 6.75 | |
Slider | 82.90 | 1.99 | 1.61 | |
Curveball | 77.97 | 6.85 | -5.23 | |
2-seam Fastball | 89.90 | -7.98 | 5.54 |
Negative values on horizontal break means the pitch is in to righties, and positive values mean it's in to lefties. 1.99 mean's it's fairly down the middle of the plate.
Stinson threw 13 fastballs, 3 curves, 2 changeups and 1 slider and 2 seam fastball.
So, his fastball breaks inside to righties, his curveball breaks inside and down to lefties, and low and away from righties, which seems to make it a good out pitch.
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