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Inland Empire Summer ID: Pitcher Data Dive

June 8, 2026
By: Gavin Smith
Manager, Content & Operations

On Tuesday, June 2nd, the Prep Baseball California team hosted the Inland Empire Summer ID at Hart Park in Orange, Cal. This was an open event for all high school classes (2026-2030), and gave our staff an ample look at the area's top prospects.

Nearly 20 players made their way to Orange and 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 California staff.

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 below:

FASTBALL

VELOCITY (MAX)

Rank Name State School Class Pos Velocity (max)
1 Grant Thomas CA Rancho Cucamonga High 2027 1B 86.7 mph
2 Isaiah Seawright CA Damien 2028 RHP 83.8 mph
3 Riely Loggins CA Simi Valley High 2029 SS 83.5 mph

SPIN RATE (AVG.)

Rank Name State School Class Pos Spin Rate (avg)
1 Gavin Carcelen CA Los Osos High 2029 SS 2197 rpm
2 Grant Thomas CA Rancho Cucamonga High 2027 1B 2123 rpm
3 Isaiah Seawright CA Damien 2028 RHP 2101 rpm
4 Joseph Keller CA Damien 2027 RHP 2032 rpm
5 Riely Loggins CA Simi Valley High 2029 SS 2021 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 David Ruiz CA Arlington High 2028 OF 19.0 in
2 Grant Thomas CA Rancho Cucamonga High 2027 1B 16.8 in
3 Isaiah Seawright CA Damien 2028 RHP 14.3 in
4 Gavin Carcelen CA Los Osos High 2029 SS 13.5 in
5 Riely Loggins CA Simi Valley High 2029 SS 12.5 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 Mason Kiemeney CA Ontario Christian School 2029 RHP 15.3
2 Grant Thomas CA Rancho Cucamonga High 2027 1B 11.5
3 David Ruiz CA Arlington High 2028 OF 11.4
4 Vincent Johns CA Centennial High 2028 LHP -10.5
5 Isaiah Seawright CA Damien 2028 RHP 10.1

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 Riely Loggins CA Simi Valley High 2029 SS 100 %
2 Isaiah Seawright CA Damien 2028 RHP 83 %
3 Vincent Johns CA Centennial High 2028 LHP 71 %
4 Gavin Carcelen CA Los Osos High 2029 SS 60 %
5 David Ruiz CA Arlington High 2028 OF 50 %
^ Grant Thomas CA Rancho Cucamonga High 2027 1B 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 Grant Thomas CA Rancho Cucamonga High 2027 1B 2329 rpm
2 Vincent Johns CA Centennial High 2028 LHP 2132 rpm
3 David Ruiz CA Arlington High 2028 OF 2110 rpm

INDUCED VERTICAL BREAK (AVG.)

Rank Name State School Class Pos IVB (avg)
1 Joseph Keller CA Damien 2027 RHP -10.9 in
2 David Ruiz CA Arlington High 2028 OF -8.2 in
3 Vincent Johns CA Centennial High 2028 LHP -5.0 in

HORIZONTAL MOVEMENT (AVG.)

Rank Name State School Class Pos HM (avg)
1 Joseph Keller CA Damien 2027 RHP -15.0
2 Vincent Johns CA Centennial High 2028 LHP 12.1
3 David Ruiz CA Arlington High 2028 OF -6.1

STRIKE ZONE RATE%

Rank Name State School Class Pos Zone %
1 David Ruiz CA Arlington High 2028 OF 60 %
2 Vincent Johns CA Centennial High 2028 LHP 50 %
^ Riely Loggins CA Simi Valley High 2029 SS 50 %
3 Joseph Keller CA Damien 2027 RHP 40 %

SLIDER

SPIN RATE (AVG.)

Rank Name State School Class Pos Spin Rate (avg)
1 Isaiah Seawright CA Damien 2028 RHP 2582
2 Gavin Carcelen CA Los Osos High 2029 SS 2189
3 Riely Loggins CA Simi Valley High 2029 SS 2174

INDUCED VERTICAL BREAK (AVG.)

Rank Name State School Class Pos IVB (avg)
1 Isaiah Seawright CA Damien 2028 RHP -7.5 in
2 Gavin Carcelen CA Los Osos High 2029 SS 7.2 in
3 Riely Loggins CA Simi Valley High 2029 SS -2.4 in

HORIZONTAL MOVEMENT (AVG.)

Rank Name State School Class Pos HM (avg)
1 Vincent Johns CA Centennial High 2028 LHP 17.8
2 Isaiah Seawright CA Damien 2028 RHP -11.2
3 Gavin Carcelen CA Los Osos High 2029 SS -11.1

STRIKE ZONE RATE%

Rank Name State School Class Pos Zone %
1 Riely Loggins CA Simi Valley High 2029 SS 66 %
2 Gavin Carcelen CA Los Osos High 2029 SS 50 %
3 Isaiah Seawright CA Damien 2028 RHP 33 %

CHANGEUP

INDUCED VERTICAL BREAK (AVG.)

Rank Name State School Class Pos IVB (avg)
1 David Ruiz CA Arlington High 2028 OF 13.2 in
2 Riely Loggins CA Simi Valley High 2029 SS 12.1 in
3 Isaiah Seawright CA Damien 2028 RHP 10.3 in

HORIZONTAL MOVEMENT (AVG.)

Rank Name State School Class Pos HM (avg)
1 Grant Thomas CA Rancho Cucamonga High 2027 1B 16.8
2 Mason Kiemeney CA Ontario Christian School 2029 RHP 16.0
3 Joseph Keller CA Damien 2027 RHP 14.0

STRIKE ZONE RATE%

Rank Name State School Class Pos Zone %
1 Isaiah Seawright CA Damien 2028 RHP 100 %
2 Gavin Carcelen CA Los Osos High 2029 SS 85 %
3 Grant Thomas CA Rancho Cucamonga High 2027 1B 80 %

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

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