West Suburban Summer ID: Pitching Data Dive
June 28, 2024
On June 25th, the Prep Baseball Illinois staff hosted the West Suburban Summer ID at Lee Pfund Field in Carol Stream, Ill. Over 30 players participated 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 Illinois staff.
On Wednesday, we looked at the top measurable data performers from the event, found in our Statistical Analysis, where we broke down the stat leaders from the more traditional categories. Yesterday we released our Quick Hits from the event, highlighting some of the event's top prospects.
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:
TRACKMAN
FASTBALL
VELOCITY (MAX)
Rank | Name | State | School | Class | Pos | Velocity (max) |
1 | Sean McNair | IL | Deerfield | 2026 | LHP | 87.4 mph |
2 | Liam Nash | IL | Westminster Christian | 2027 | RHP | 85.4 mph |
3 | Jack Compton | IL | North Clay Community | 2026 | RHP | 84.5 mph |
4 | Jackson Mansker | IL | Lincoln-Way West | 2026 | 3B | 83.5 mph |
5 | Cooper Harris | IL | Stevenson | 2025 | 1B | 82.1 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 | Jackson Mansker | IL | Lincoln-Way West | 2026 | 3B | 2453 rpm |
2 | Zachary Seiler | IL | Libertyville | 2025 | RHP | 2248 rpm |
3 | Jonathan Tschanz | IL | St Viator | 2026 | SS | 2207 rpm |
4 | Cooper Harris | IL | Stevenson | 2025 | 1B | 2172 rpm |
5 | Liam Nash | IL | Westminster Christian | 2027 | 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 | Grenning Abraham | IL | York | 2027 | 3B | 18.5 in |
2 | Zachary Seiler | IL | Libertyville | 2025 | RHP | 18.1 in |
3 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 15.1 in |
4 | Cooper Harris | IL | Stevenson | 2025 | 1B | 15.1 in |
5 | Sean McNair | IL | Deerfield | 2026 | LHP | 14.4 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 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.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Cooper Harris | IL | Stevenson | 2025 | 1B | -14.4 |
2 | Sean McNair | IL | Deerfield | 2026 | LHP | -14.2 |
3 | Jonathan Tschanz | IL | St Viator | 2026 | SS | 12.5 |
4 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 11.2 |
5 | Henry Meade | IL | York | 2027 | RHP | 10.9 |
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 | Liam Nash | IL | Westminster Christian | 2027 | RHP | 62 % |
^ | Zachary Seiler | IL | Libertyville | 2025 | RHP | 62 % |
2 | Jackson Mansker | IL | Lincoln-Way West | 2026 | 3B | 50 % |
^ | Jack Compton | IL | North Clay Community | 2026 | RHP | 50 % |
^ | Jonathan Tschanz | IL | St Viator | 2026 | SS | 50 % |
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.)
Rank | Name | State | School | Class | Pos | Spin Rate (avg) |
1 | Zachary Seiler | IL | Libertyville | 2025 | RHP | 2484 rpm |
2 | Jonathan Tschanz | IL | St Viator | 2026 | SS | 2379 rpm |
3 | Liam Nash | IL | Westminster Christian | 2027 | RHP | 2374 rpm |
4 | Cooper Harris | IL | Stevenson | 2025 | 1B | 2330 rpm |
5 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 2130 rpm |
INDUCED VERTICAL BREAK (AVG.)
Rank | Name | State | School | Class | Pos | IVB (avg) |
1 | Dominic Capiga | IL | Oswego East | 2025 | RHP | -10.2 in |
2 | Nathan Beers | IL | St. Charles East | 2025 | LHP | -7.6 in |
3 | Liam Nash | IL | Westminster Christian | 2027 | RHP | -7.5 in |
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Liam Nash | IL | Westminster Christian | 2027 | RHP | -13.2 |
2 | Cooper Harris | IL | Stevenson | 2025 | 1B | 12.3 |
3 | Zachary Seiler | IL | Libertyville | 2025 | RHP | -10.9 |
4 | Dominic Capiga | IL | Oswego East | 2025 | RHP | -10.5 |
5 | Jonathan Tschanz | IL | St Viator | 2026 | SS | -10.1 |
STRIKE ZONE RATE%
Rank | Name | State | School | Class | Pos | Zone % |
1 | Cooper Harris | IL | Stevenson | 2025 | 1B | 75 % |
2 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 60 % |
3 | Jonathan Tschanz | IL | St Viator | 2026 | SS | 57 % |
SLIDER
SPIN RATE (AVG.)
Rank | Name | State | School | Class | Pos | Spin Rate (avg) |
1 | Jackson Mansker | IL | Lincoln-Way West | 2026 | 3B | 2546 |
2 | Liam Nash | IL | Westminster Christian | 2027 | RHP | 2414 |
3 | Zachary Seiler | IL | Libertyville | 2025 | RHP | 2392 |
4 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 2203 |
5 | Sean McNair | IL | Deerfield | 2026 | LHP | 1992 |
INDUCED VERTICAL BREAK (AVG.)
Rank | Name | State | School | Class | Pos | IVB (avg) |
1 | Liam Nash | IL | Westminster Christian | 2027 | RHP | -6.6 in |
2 | Sean McNair | IL | Deerfield | 2026 | LHP | 5.2 in |
3 | Zachary Seiler | IL | Libertyville | 2025 | RHP | -4.0 in |
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Zachary Seiler | IL | Libertyville | 2025 | RHP | -12.6 |
2 | Dominic Capiga | IL | Oswego East | 2025 | RHP | -11.0 |
3 | Liam Nash | IL | Westminster Christian | 2027 | RHP | -10.9 |
STRIKE ZONE RATE%
Rank | Name | State | School | Class | Pos | Zone % |
1 | Jack Compton | IL | North Clay Community | 2026 | RHP | 60 % |
2 | Sean McNair | IL | Deerfield | 2026 | LHP | 40 % |
^ | Luke Ranieri | IL | Willowbrook High School | 2026 | RHP | 40 % |
CHANGEUP
SPIN RATE (AVG.)
Rank | Name | State | School | Class | Pos | Spin Rate (avg) |
1 | Jackson Mansker | IL | Lincoln-Way West | 2026 | 3B | 2045 rpm |
2 | Nathan Beers | IL | St. Charles East | 2025 | LHP | 1900 rpm |
3 | Cooper Harris | IL | Stevenson | 2025 | 1B | 1836 rpm |
INDUCED VERTICAL BREAK (AVG.)
Rank | Name | State | School | Class | Pos | IVB (avg) |
1 | Henry Meade | IL | York | 2027 | RHP | 12.5 in |
2 | Zachary Seiler | IL | Libertyville | 2025 | RHP | 11.6 in |
3 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 11.6 in |
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Jack Compton | IL | North Clay Community | 2026 | RHP | 15.1 |
2 | Liam Nash | IL | Westminster Christian | 2027 | RHP | 12.2 |
3 | Cooper Harris | IL | Stevenson | 2025 | 1B | -11.2 |
STRIKE ZONE RATE%
Rank | Name | State | School | Class | Pos | Zone % |
1 | Dominic Capiga | IL | Oswego East | 2025 | RHP | 60 % |
2 | Cooper Harris | IL | Stevenson | 2025 | 1B | 50 % |
+ CLICK HERE for a look at the complete statistics from the event.
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