This past Saturday and Sunday, the PBR Arizona staff hosted it's marquee event of the preseason with the Underclass Preseason All-State at Casteel High School in Queen Creek, Arizona. This event featured roughly 85 prospects from the 2026 and 2027 classes and featured a large crop of Arizona's top underclass prospects for a pro-style workout on Saturday, followed by live-game action on Sunday.

The event allowed our staff to collect updated data on all athletes, as well as give us an up-close look at the players ahead of the high school season and our updated rankings that will be rolling out.

Earlier this week, we broke down the top measurable data performers from the event with our Statistical Analysis article. Now, we will take a further in-depth look at the top pitchers with the help of our tech partnerships, broken down by the categories down below:

For complete event results, click here.
To view upcoming event schedule, click here.

FASTBALL

MAX VELOCITY (MPH)

Max Fastball Velocity: This metric calculates the speed of the pitch as it’s released from the pitcher’s hand.

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 efficiency. 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 the 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%

CURVEBALL

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE %

SLIDER

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

CHANGEUP

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

UPCOMING EVENTS

SHOWCASE	STATE	DATE	LOCATION
Mesa Preseason ID	AZ	01/31	Desert Ridge High School - Mesa, AZ
Preseason All-State Games: Upperclass (Invite-Only)	AZ	02/03	Cactus Shadows High School - Scottsdale, AZ
Super 60 Pro Showcase	NATIONAL	02/04	The MAX - McCook, IL
Arizona Rising Stars ID	AZ	04/13	Grand Canyon University - Phoenix, AZ
Arizona Rising Stars ID - Session 2	AZ	04/27	Grand Canyon University - Phoenix, AZ

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