This past Monday and Tuesday, the Prep Baseball Arizona staff continued it's Summer Tour as we hosted our marquee event of the summer for underclassman with the Underclass Top Prospect Games at American Family Fields of Phoenix, the Spring Training home of the Milwaukee Brewers. This event featured roughly 25 prospects from the 2027 and 2028 classes and featured several top players within their respective classes.

The event allowed our staff to collect updated data on all athletes following their high school season, as well as see how they perform and handle themselves within game action competing against other high-evel players.

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.)

SLIDER

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

CHANGEUP

HORIZONTAL MOVEMENT (AVG.)

UPCOMING EVENTS

SHOWCASE	STATE	DATE	LOCATION
West Side Summer ID	AZ	06/18	Canyon View High School - Waddell, AZ
Glendale Summer ID	AZ	07/16	Apollo High School - Glendale, AZ
Future Games (Class of 2026/27)	NATIONAL	07/24	LakePoint Sports
Junior Future Games (Class of 2028/29)	NATIONAL	07/24	LakePoint Sports
Senior Future Games (Class of 2025)	NATIONAL	07/24	LakePoint Sports

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