Underclass Top Prospect Games: Pitching Data Dive
June 14, 2024
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)
Rank | Name | State | School | Class | Pos | Velocity (max) |
1 | Maverick Bolen | AZ | Horizon High School | 2027 | C | 83.6 mph |
2 | Evan Rios | AZ | N/A | 2028 | RHP | 80.7 mph |
3 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | 79.3 mph |
4 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 79.2 mph |
5 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 78.4 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 | Maverick Bolen | AZ | Horizon High School | 2027 | C | 2186 rpm |
2 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 2045 rpm |
3 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | 1976 rpm |
4 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | 1955 rpm |
5 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 1843 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 | Evan Rios | AZ | N/A | 2028 | RHP | 17.1 in |
2 | Jack Josephson | AZ | Chaparral | 2027 | SS | 16.1 in |
3 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | 15.8 in |
4 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 13.7 in |
5 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 13.1 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 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 10.8 |
2 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | 10.2 |
3 | Evan Rios | AZ | N/A | 2028 | RHP | 9.3 |
4 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 9.2 |
5 | Maverick Bolen | AZ | Horizon High School | 2027 | C | 9.2 |
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 | Evan Rios | AZ | N/A | 2028 | RHP | 60 % |
2 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | 59 % |
CURVEBALL
SPIN RATE (AVG.)
Rank | Name | State | School | Class | Pos | Spin Rate (avg) |
1 | Maverick Bolen | AZ | Horizon High School | 2027 | C | 1927 rpm |
2 | Jack Josephson | AZ | Chaparral | 2027 | SS | 1586 rpm |
INDUCED VERTICAL BREAK (AVG.)
Rank | Name | State | School | Class | Pos | IVB (avg) |
1 | Evan Rios | AZ | N/A | 2028 | RHP | 17.1 in |
2 | Jack Josephson | AZ | Chaparral | 2027 | SS | 16.1 in |
3 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | 15.8 in |
4 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 13.7 in |
5 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 13.1 in |
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Jack Josephson | AZ | Chaparral | 2027 | SS | -9.2 |
2 | Maverick Bolen | AZ | Horizon High School | 2027 | C | -0.4 |
SLIDER
SPIN RATE (AVG.)
Rank | Name | State | School | Class | Pos | Spin Rate (avg) |
1 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | 1991 |
2 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | 1912 |
3 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 1784 |
4 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 1757 |
5 | Evan Rios | AZ | N/A | 2028 | RHP | 1675 |
INDUCED VERTICAL BREAK (AVG.)
Rank | Name | State | School | Class | Pos | IVB (avg) |
1 | Evan Rios | AZ | N/A | 2028 | RHP | -3.7 in |
2 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | -3.1 in |
3 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 2.7 in |
4 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | 2.2 in |
5 | Peyton Burgess | AZ | Millennium High School | 2028 | C | -1.9 in |
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Xzaiver Trujillo | AZ | Tolleson Union High School | 2027 | OF | -9.1 |
2 | Hunter Halvorson | AZ | Chaparral High School | 2027 | RHP | -8.3 |
3 | Peyton Burgess | AZ | Millennium High School | 2028 | C | -6.4 |
4 | Evan Rios | AZ | N/A | 2028 | RHP | -4.4 |
5 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | -2.2 |
CHANGEUP
HORIZONTAL MOVEMENT (AVG.)
Rank | Name | State | School | Class | Pos | HM (avg) |
1 | Maverick Bolen | AZ | Horizon High School | 2027 | C | 17.1 |
2 | Kohler Mobley | AZ | Shadow Ridge High School | 2028 | C | 15.8 |
3 | Peyton Burgess | AZ | Millennium High School | 2028 | C | 9.1 |
4 | Jack Josephson | AZ | Chaparral | 2027 | SS | -2.6 |
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 |
RECENT NEWS
- AZ West Side ID: Quick Hits 6/23/24
- AZ West Side Summer ID: Positional Data Dive 6/23/24
- AZ West Side Summer ID: Pitching Data Dive 6/22/24
- AZ West Side Summer ID: Statistical Analysis 6/21/24
- AZ Underclass Top Prospects Games: Positional Data Dive 6/15/24
- AZ Underclass Top Prospect Games: Pitching Data Dive 6/14/24
- AZ Upperclass Top Prospect Games: Positional Data Dive 6/09/24
- AZ Upper Class Top Prospect: Quick Hits 6/08/24