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BAKERSFIELD, CALIF. - This past Saturday, December 6th, the Prep Baseball California team is hosted our final Fall ID of the 2025 calendar with the Bakersfield Fall ID hosted at CSU-Bakersfield in Bakersfield, CA. This open event was for all high school classes (2026-2029), and provided our staff an opportunity to expand our knowledge on some of the area's top rising players.

Around 20 players made their way to Hardt Field on the campus of CSU-Bakersfield to participate in a pro-style workout, gathering unrivaled access to data through our state-of-the-art tech partners, as well as in-depth scouting analysis from our Prep Baseball California staff. This group featured some interesting underclass names to keep eyes on out of the region with some strong performances out of the upperclass products in attendance. 

Today, we will be looking at the top measurable data performers from the bullpen portion of the event, found below.

Trackman

FASTBALL

VELOCITY (MAX)

SPIN RATE (AVG.)

Spin Rate: This metric calculates the rate of spin on the baseball as it leaves the pitcher’s hand, measured in revolutions per minute (rpm). Historical data shows that high-spin fastballs lessen the impact of gravity, allowing for more ‘rise’ (or less fall, in other words) as it carries through the zone. Low-spin fastballs typically indicate the pitch has greater horizontal action, often making it tougher to square up, but generally easier to make contact with, leading to more ground balls, while high-spin fastballs show a correlation with swings and misses.

INDUCED VERTICAL BREAK (AVG.)

Induced Vertical Break: Used in short form as "IVB," this metric is most important on fastballs for creating rise and on curveballs for creating depth – it can also have some use when measuring sliders and cutters as well. Sliders tend to be closer to zero inches while cutters are generally between 5 and 15 inches. Usually fastballs and curveballs with large IVB have higher spin efficiencies as well. Sliders generally have very little (closer to zero) IVB and very low spin efficiencies. You could also categorize IVB into spin rate as this is part of the “useful movement” you’re looking for. IVB is also a huge part of vertical approach angle.

HORIZONTAL MOVEMENT (AVG.)

Horizontal Break: Outlined on TrackMan’s own website: “... horizontal movement is measured in inches between where the pitch actually crosses the front of home plate side-wise, and where it would have crossed home plate side-wise if had it traveled in a perfectly straight line from release. A positive number means the break was to the right from the pitcher’s perspective, while a negative number means the break was to the left from the pitcher’s perspective.”

STRIKE ZONE RATE%

 Average MLB pitchers throw 62% strikes, and better pitchers throw strikes 65% of the time, or roughly 2:1 strikes to balls.

CURVEBALL

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

SLIDER

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

CHANGEUP

Spin Rate (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

+ CLICK HERE for a look at the complete statistics from the event.

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