West Milwaukee Preseason ID: Pitcher Data Dive
February 27, 2023
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 | 2025 | RHP | 89.8 mph |
2 | Peter Kussow | WI | Arrowhead | 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 | 2025 | RHP | 83.6 mph |
10 | Tyson Grulkowski | WI | Muskego | 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
3B
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
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.)
Rank
Name
State
School
Class
Pos
HM (avg)
1
Caiden Mentkowski
IL
Antioch
2025
SS
16.1
2
Charlie Slawinski
WI
Brookfield East
2025
RHP
14.6
3
Tyson Baker
WI
Germantown High
2025
LHP
-13.6
4
Dean Staudacher
WI
Muskego
2025
SS
13.5
5
Colton Semmelmann
WI
Brookfield Central
2026
LHP
-13.5
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%
Rank
Name
State
School
Class
Pos
Zone %
1
Jack Welak
WI
Catholic Memorial
2025
RHP
66 %
2
Miken Haddon
WI
Catholic Memorial
2026
1B
57 %
3
Jack Stuck
WI
Nicolet
2025
RHP
50 %
^
Nathan Huntley
WI
Brookfield Central
2025
2B
50 %
CURVEBALL
SPIN RATE (AVG.)
Rank
Name
State
School
Class
Pos
Spin Rate (avg)
1
Sean Beug-Hoffman
WI
Brookfield Central
2025
RHP
2548 rpm
2
Parker Meifert
WI
Greenfield
2024
RHP
2458 rpm
3
Tyson Grulkowski
WI
Muskego
2026
RHP
2329 rpm
4
Colton Semmelmann
WI
Brookfield Central
2026
LHP
2322 rpm
5
Owen Dobberstein
WI
Pewaukee
2025
RHP
2288 rpm
6
Noah Melby
WI
Brookfield East
2026
RHP
2252 rpm
INDUCED VERTICAL BREAK (AVG.)
Rank
Name
State
School
Class
Pos
IVB (avg)
1
Sean Beug-Hoffman
WI
Brookfield Central
2025
RHP
-10.5 in
2
Carsen Dulak
WI
Germantown
2024
OF
-9.9 in
3
Brayden Ramus
WI
Arrowhead
2024
RHP
-9.4 in
4
Vincent Bitter
WI
Brookfield Central
2026
RHP
-8.2 in
HORIZONTAL MOVEMENT (AVG.)
Rank
Name
State
School
Class
Pos
IVB (avg)
1
Sean Beug-Hoffman
WI
Brookfield Central
2025
RHP
-10.5 in
2
Carsen Dulak
WI
Germantown
2024
OF
-9.9 in
3
Brayden Ramus
WI
Arrowhead
2024
RHP
-9.4 in
4
Vincent Bitter
WI
Brookfield Central
2026
RHP
-8.2 in
5
Dean Staudacher
WI
Muskego
2025
SS
8.1 in
6
Ethan Daily
WI
Waukesha North
2026
3B
6.8 in
7
Cooper Haas
WI
Waukesha North
2025
LHP
-6.8 in
8
Colton Semmelmann
WI
Brookfield Central
2026
LHP
-6.4 in
9
Tyson Grulkowski
WI
Muskego
2026
RHP
-6.4 in
10
Parker Meifert
WI
Greenfield
2024
RHP
-6.0 in
STRIKE ZONE RATE%
Rank
Name
State
School
Class
Pos
Zone %
1
Owen Dobberstein
WI
Pewaukee
2025
RHP
80 %
^
Noah Melby
WI
Brookfield East
2026
RHP
80 %
2
Parker Meifert
WI
Greenfield
2024
RHP
60 %
^
Ethan Daily
WI
Waukesha North
2026
3B
60 %
^
Greyson Zach
WI
Pewaukee
2025
RHP
60 %
^
Miken Haddon
WI
Catholic Memorial
2026
1B
60 %
^
Caiden Mentkowski
IL
Antioch
2025
SS
60 %
SLIDER
SPIN RATE (AVG.)
Rank
Name
State
School
Class
Pos
Spin Rate (avg)
1
Peter Kussow
WI
Arrowhead
2025
RHP
2685
2
Tyson Grulkowski
WI
Muskego
2026
RHP
2620
3
Owen Dobberstein
WI
Pewaukee
2025
RHP
2433
4
Bradyn Nelson
WI
Oconomowoc
2024
3B
2238
5
Colton Semmelmann
WI
Brookfield Central
2026
LHP
2187
INDUCED VERTICAL BREAK (AVG.)
Rank
Name
State
School
Class
Pos
IVB (avg)
1
Charlie Slawinski
WI
Brookfield East
2025
RHP
-8.6 in
2
Cail Geiger
WI
Menomonee Falls
2026
RHP
7.4 in
3
Nicholas (Niko) Frangopoulos
WI
Arrowhead
2026
OF
-7.2 in
4
Ryan Brennecke
WI
Oconomowoc
2025
LHP
6.4 in
5
Jack Welak
WI
Catholic Memorial
2025
RHP
-6.3 in
6
CJ Zehner
WI
Arrowhead
2025
RHP
6.2 in
HORIZONTAL MOVEMENT (AVG.)
Rank
Name
State
School
Class
Pos
HM (avg)
1
Colton Semmelmann
WI
Brookfield Central
2026
LHP
15.3
2
Peter Kussow
WI
Arrowhead
2025
RHP
-14.5
3
Tyson Grulkowski
WI
Muskego
2026
RHP
-14.5
4
Bradyn Nelson
WI
Oconomowoc
2024
3B
-13.3
5
Vincent Bitter
WI
Brookfield Central
2026
RHP
-12.6
STRIKE ZONE RATE%
Rank
Name
State
School
Class
Pos
Zone %
1
Liam St. Denis
WI
Wauwatosa East
2025
RHP
80 %
2
Peter Kussow
WI
Arrowhead
2025
RHP
75 %
3
Ben Weber
WI
Oconomowoc
2026
1B
60 %
^
Charlie Slawinski
WI
Brookfield East
2025
RHP
60 %
4
Owen Dobberstein
WI
Pewaukee
2025
RHP
50 %
CHANGEUP
HORIZONTAL MOVEMENT (AVG.)
Rank
Name
State
School
Class
Pos
HM (avg)
1
Cail Geiger
WI
Menomonee Falls
2026
RHP
22.9
2
Ethan Arnold
WI
Fond du lac
2025
RHP
18.8
3
Jack Welak
WI
Catholic Memorial
2025
RHP
16.7
4
Parker Meifert
WI
Greenfield
2024
RHP
16.3
5
Ryan Brennecke
WI
Oconomowoc
2025
LHP
-15.6
6
Vincent Bitter
WI
Brookfield Central
2026
RHP
15.3
7
Devan Gentry-Komasa
WI
West Bend East
2024
RHP
15.2
STRIKE ZONE RATE%
Rank
Name
State
School
Class
Pos
Zone %
1
Owen Dobberstein
WI
Pewaukee
2025
RHP
100 %
^
Alex Ignacio
WI
Brookfield Central
2025
2B
100 %
^
Eli Bryant
WI
Beaver Dam
2025
SS
100 %
2
Jack Stuck
WI
Nicolet
2025
RHP
80 %
^
Vincent Bitter
WI
Brookfield Central
2026
RHP
80 %
^
Zachary Kiffmeyer
WI
Oshkosh North
2025
RHP
80 %
3
Mason Sommer
WI
West Bend East
2025
LHP
75 %
4
Carsen Dulak
WI
Germantown
2024
OF
66 %
^
CJ Zehner
WI
Arrowhead
2025
RHP
66 %
5
Noah Melby
WI
Brookfield East
2026
RHP
60 %
^
TJ Allemand
WI
Wayland Academy
2026
LHP
60 %
^
Mason Sherman
WI
Waukesha West
2024
RHP
60 %
^
Charlie Slawinski
WI
Brookfield East
2025
RHP
60 %
^
Zach Flater
WI
Waterford High
2025
SS
60 %
^
Parker Meifert
WI
Greenfield
2024
RHP
60 %
^
Tyson Baker
WI
Germantown High
2025
LHP
60 %
^
Sean Beug-Hoffman
WI
Brookfield Central
2025
RHP
60 %
+ CLICK HERE for a look at the complete statistics from the event.