On Feb. 18, the PBR Wisconsin staff hosted the West Milwaukee Preseason ID at GRB STiKS Academy in Waukesha, Wis. This event featured 108 prospects, most of whom are Wisconsin natives, and allowed our staff an opportunity to get an in-depth look at the players in attendance.

Wednesday, we published our Quick Hits from the players from the event. Thursday, we broke down the top measurable data performers from the event with our Statistical Analysis. Today, 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:

 

TRACKMAN

FASTBALL

VELOCITY (MAX)

Rank	Name	State	School	Class	Pos	Velocity (max)
1	Greyson Zach	WI	Pewaukee High	2025	RHP	89.8 mph
2	Peter Kussow	WI	Arrowhead High	2025	RHP	89.5 mph
3	Eli Bryant	WI	Beaver Dam	2025	SS	87.7 mph
4	Mason Sherman	WI	Waukesha West	2024	RHP	87.4 mph
5	Parker Meifert	WI	Greenfield	2024	RHP	86.7 mph
6	Carsen Dulak	WI	Germantown	2024	OF	85.3 mph
7	Sean Beug-Hoffman	WI	Brookfield Central	2025	RHP	84.6 mph
8	Zachary Kiffmeyer	WI	Oshkosh North	2025	RHP	83.7 mph
9	Charlie Slawinski	WI	Brookfield East High	2025	RHP	83.6 mph
10	Tyson Grulkowski	WI	Muskego High School	2026	RHP	83.2 mph

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

SPIN RATE (AVG.)

Rank	Name	State	School	Class	Pos	Spin Rate (avg)
1	Bradyn Nelson	WI	Oconomowoc	2024	OF	2357 rpm
2	Jack Welak	WI	Catholic Memorial	2025	RHP	2252 rpm
3	Parker Meifert	WI	Greenfield	2024	RHP	2195 rpm
4	Tyson Grulkowski	WI	Muskego High School	2026	RHP	2180 rpm
5	Sean Beug-Hoffman	WI	Brookfield Central	2025	RHP	2161 rpm

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.)

Rank	Name	State	School	Class	Pos	IVB (avg)
1	Graiden Liethen	WI	Arrowhead High	2025	RHP	17.6 in
2	Sean Beug-Hoffman	WI	Brookfield Central	2025	RHP	16.8 in
3	Alex Ignacio	WI	Brookfield Central	2025	2B	16.3 in
4	Brady Carpenter	WI	Arrowhead	2024	OF	15.2 in
5	Preston Manthei	WI	Lake Country Lutheran	2025	3B	15.2 in

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%

 

 

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CURVEBALL

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

 

 

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SLIDER

SPIN RATE (AVG.)

INDUCED VERTICAL BREAK (AVG.)

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

 

 

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CHANGEUP

HORIZONTAL MOVEMENT (AVG.)

STRIKE ZONE RATE%

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

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