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A 4 seam FB rides better along a straight-line flight path from release to target due to magnus force produced from backspin that fights gravity. The better the raw spin rate along with spin axis that creates spin efficiency the LESS “induced vertical break” there is. Therefore, the less a 4 seamer drops the better the pitch.

or maybe my old school brain Is completely wrong with all this new school terminology, if so sorry for the confusion



Induced Vertical Break
= Distance between where the pitch actually crosses the front of home plate height-wise, and where it would have crossed home plate height-wise if it had traveled in a perfectly straight line from release, but affected by gravity. Note: If this number is positive, the ball broke “upwards”, or in reality dropped less than it would have due to gravity alone – it does not necessarily mean that the ball actually rose.

Last edited by 22and25

The term is actually a bit of a misnomer. It’s a measure of a pitch’s resistance to gravity or resistance to downward break.  As noted above, magnus effect causes the ball to drop less creating “ride” on the four seam fastball.  Higher velocity accounts for the lower numbers as you move up into higher levels of play.  A ball traveling 90 MPH over 50 feet has less gravity induced drop than a ball traveling 70 MPH over the same distance thus spin has more gravity induced break to mitigate in the slower pitch.

Last edited by 22and25
@Good Knight posted:

Ok so I have FB velo of 93.5 and IVB FB of 19.8. Pls explain. and HS Senior.

It means that your son’s fastball hits the mitt almost 20 inches higher than it would without any magnus effect produced by the spin of the ball.  This theoretical point of impact is used as a baseline to compare pitchers.  The average pitcher may get 15” of “ride” (point of impact above the theoretical baseline)  from the spin they impart on the ball.  Your son’s pitch will come in at 20“ above the baseline because he has higher than average spin.  The amount of “ride” he gets on the ball puts him in the top 20% roughly of current college pitchers that have data available.

When it comes to numbers like this, you want to be an outlier to “fool a hitter’s eye”.  Hitters are programmed for average in that their brain calculates the drop of the pitch from the point the eye last sees the ball and the point of bat to ball contact.  Many people think the batter “sees the ball hit the bat” but that is not correct.  The brain stops getting reliable data from the eyes while the ball is well out in front of the plate and has to calculate where the ball will be in space at the point of bat/ball collision.

This is where the value of spin and IVB lies.  If a pitcher’s fastball, due to higher average spin rate, arrives higher than the brain is accustomed to the batter will swing under the ball.  

Please keep in mind that not everyone in baseball understands these numbers or embraces them.  Some coaches may care, many will not.

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