84.1
Velocity (max)
8/08/26
CLASS OF 2029
RHP
SS
Bronx
Siebersma
Maple Valley-Anthon Oto (HS) • IA
5' 9" • 177LBS
R/R • 15yr 7mo
Travel Team: Future Fall Showcase
5' 9" • 177LBS
R/R • 15yr 7mo
Travel Team: Future Fall Showcase
Rankings
2029 National
Rankings available to Premium Subscriber
2029 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
Fastball
81.1 - 83.5
Velo Range
8/08/26
2218
Spin Rate (avg)
8/08/26
Slider
69 - 71.1
Velo Range
8/08/26
2229
Spin Rate (avg)
8/08/26
97.3
Exit Velocity (max)
8/08/26
69.1
Exit Velocity (avg)
8/08/26
259
Distance (max)
8/08/26
50
Sweet Spot %
8/08/26
23.6
Hand Speed (max)
8/08/26
77.2
Bat Speed (max)
8/08/26
28.7
Rot. Acc (max)
8/08/26
33
Hard Hit %
8/08/26
6.90
60-yd
8/08/26
3.88
30-yd
8/08/26
1.73
10-yd
8/08/26
20.3
Run speed (max)
8/08/26
Positional Tools
2026
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
6.90
Power / Speed Score
A simple calculation that divides the athlete’s Exit Velocity Max by the athlete’s 60 Yard Dash time for the given event year. For example, 98 MPH / 7.00s = 14.00.
14.1
Hitting
2026
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
97.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
69.1
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
259
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
152
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
24.1207
Hard Hit %
Percentage of batted balls with exit velocities over 90 MPH in the given event year.
Sweet Spot %
Percentage of batted balls in the given event year with a launch angle between 8° and 32°.
Line Drive %
Percentage of batted balls with launch angles between 10 and 25 degrees in the given event year.
Fly Ball %
Percentage of batted balls with launch angles between 25 and 50 degrees in the given event year.
Ground Ball %
Percentage of batted balls with launch angles below 10 degrees in the given event year.
Iowa Top Prospect Games (Invite-Only)
Aug 8, 2026
Trackman - Hitting
97.3
Exit Velocity (max)
69.1
Exit Velocity (avg)
152
Distance (avg)
259
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2026
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
23.6
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
22.4
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
77.2
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
70.3
Rotational Acceleration Max
The highest Rotational Acceleration of any swing in the given event year.
Rotational Acceleration Avg
The average Rotational Acceleration for all swings in the given event year.
On-Plane Efficiency Max
The highest On-Plane Efficiency of any swing in the given event year.
On-Plane Efficiency Avg
The average On-Plane Efficiency for all swings in the given event year.
Iowa Top Prospect Games (Invite-Only)
Aug 8, 2026
Blast - Hitting
23.6
Hand Speed (max)
22.4
Hand Speed (avg)
77.2
Bat Speed (max)
70.3
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2026
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
84.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
82.3
Fastball
Spin Rate Avg
The average rate of spin for all pitches of this type in the given event year. Measured in rotations per minute (RPM).
2218
Fastball
Spin Score Avg
The average Bauer Units value of all fastballs in the given event year. Bauer Units are calculated for each pitch by dividing Spin Rate by Velocity.
27.0
Fastball
Total Movement Avg
The average total non-gravity movement for all pitches of this type in the given event year. Measured in inches (in).
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
70.1
Slider
Spin Rate Avg
The average rate of spin for all pitches of this type in the given event year. Measured in rotations per minute (RPM).
2229
Slider
Total Movement Avg
The average total non-gravity movement for all pitches of this type in the given event year. Measured in inches (in).
Iowa Top Prospect Games (Invite-Only)
Aug 8, 2026
Trackman - Fastball
84.1
Velocity (max)
81.1 - 83.5
Velo Range
81.3
Eff Velocity (avg)
2,294
Spin Rate (max)
2,218
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Slider
71.8
Velocity (max)
69.0 - 71.1
Velo Range
67.7
Eff Velocity (avg)
2,363
Spin Rate (max)
2,229
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Pitch Scores
2026
Fastball
Hop+
A fastball with hop has a flat approach angle and visually jumps through the zone. When thrown up in the zone, it is more likely to generate a higher swing and miss average. Hop+ of 100 is MLB average.
Fastball
Sink+
A fastball with sink has low backspin and drops through the strike zone. When thrown down in the zone, it is more likely to generate a higher ground ball percentage and lower launch angle. Sink+ of 100 is MLB average.
Fastball
Rise+
A fastball with rise has a high percentage of backspin. When thrown up in the zone, it is more likely to generate a higher fly ball percentage. Rise+ of 100 is MLB average
Slider
Hammer+
A hammer breaking ball drops vertically with velocity through the zone, or 12-to-6 movement. Hammer+ of 100 is MLB average.
Slider
Sweep+
A sweeping breaking ball moves horizontally with velocity through the zone. Sweep+ of 100 is MLB average.
Pitching Velos
Game Performance
2026
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.73
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
3.88
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
6.9
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
RSI
The reactive strength index measurement of an athlete's explosiveness by comparing their jump height to the ground contact time in between their jumps. On a scale of 0-5.
Vertical Jump
A measure of any athlete's body strength and reach calculated from the flight time divided by the contact time.
Iowa Top Prospect Games (Invite-Only)
Aug 8, 2026
Vald
1.73
10-yd
3.88
30-yd
6.90
60-yd
20.3
Run speed (max)
2.28
RSI (max)
22.9
Jump Height (max)
Vizual Edge
Pitch Ai
Notes
News
Comments
Draft Reports
Contact
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Physical
2026
Grip Strgth (LH)
Grip strength is a measure of a players bat control and ability to transfer power and speed during impact, measured in pounds of force generated; collected with elbow bent at 90 degrees.
Grip Strgth (RH)
Grip strength is a measure of a players bat control and ability to transfer power and speed during impact, measured in pounds of force generated; collected with elbow bent at 90 degrees.