@Vonnie1sen 87.6
Velocity (max)
12/23/25
CLASS OF 2029
RHP
OF
Von
Nielsen
Lakewood Ranch (HS) • FL
5' 10" • 151LBS
R/R • 15yr 11mo
Travel Team: Mine National 15u
5' 10" • 151LBSR/R • 15yr 11mo
Travel Team: Mine National 15u
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
84.4 - 86.7
Velo Range
12/23/25
2337
Spin Rate (avg)
12/23/25
Changeup
76 - 77.7
Velo Range
12/23/25
1687
Spin Rate (avg)
10/25/24
Slider
69.7 - 72.3
Velo Range
12/23/25
2446
Spin Rate (avg)
12/23/25
93.3
Exit Velocity (max)
12/23/25
84.3
Exit Velocity (avg)
12/23/25
346
Distance (max)
12/23/25
73
Sweet Spot %
10/25/24
20
Hand Speed (max)
10/25/24
74.9
Bat Speed (max)
10/25/24
22.7
Rot. Acc (max)
10/25/24
40
Hard Hit %
12/23/25
6.83
60-yd
12/23/25
3.78
30-yd
12/23/25
1.58
10-yd
12/23/25
20.1
Run speed (max)
12/23/25
78
INF Velo
10/25/24
86
OF Velo
12/23/25
-
C Velo
-
Pop Time
Positional Tools
2025
2024
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Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
86.0
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.22
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
78.0
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
81.0
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.
11.8
Hitting
2025
2024
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
93.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
84.3
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
346
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
240
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
27.1512
Hard Hit %
Percentage of batted balls with exit velocities over 95 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.
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
85.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
80.7
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
299
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
209
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
15.9946
Hard Hit %
Percentage of batted balls with exit velocities over 95 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.
Tampa Preseason ID
Dec 23, 2025
Trackman - Hitting
93.3
Exit Velocity (max)
84.3
Exit Velocity (avg)
240
Distance (avg)
346
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2024 Rising Stars State Games (Invite-Only)
Oct 25, 2024
Trackman - Hitting
85.3
Exit Velocity (max)
80.7
Exit Velocity (avg)
209
Distance (avg)
299
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2025
2024
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
19.9
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
19.4
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
69.1
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
66.1
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.
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
20.0
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
18.4
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
74.9
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
70.2
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.
Tampa Preseason ID
Dec 23, 2025
Blast - Hitting
19.9
Hand Speed (max)
19.4
Hand Speed (avg)
69.1
Bat Speed (max)
66.1
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2024 Rising Stars State Games (Invite-Only)
Oct 25, 2024
Blast - Hitting
20.0
Hand Speed (max)
18.4
Hand Speed (avg)
74.9
Bat Speed (max)
70.2
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2025
2024
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
87.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
85.5
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).
2337
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.
27.3
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
76.9
Changeup
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).
1655
Changeup
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).
71.0
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).
2446
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).
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
80.8
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
78.6
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).
2153
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.
27.4
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
72.3
Changeup
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).
1687
Changeup
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).
66.9
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).
2324
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).
Tampa Preseason ID
Dec 23, 2025
Trackman - Fastball
87.6
Velocity (max)
84.4 - 86.7
Velo Range
84.0
Eff Velocity (avg)
2,416
Spin Rate (max)
2,337
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
72.6
Velocity (max)
69.7 - 72.3
Velo Range
69.5
Eff Velocity (avg)
2,562
Spin Rate (max)
2,446
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - ChangeUp
77.7
Velocity (max)
76.0 - 77.7
Velo Range
75.3
Eff Velocity (avg)
1,733
Spin Rate (max)
1,655
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
2024 Rising Stars State Games (Invite-Only)
Oct 25, 2024
Trackman - Fastball
80.8
Velocity (max)
77.5 - 80.1
Velo Range
77.4
Eff Velocity (avg)
2,268
Spin Rate (max)
2,153
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
68.5
Velocity (max)
65.6 - 68.2
Velo Range
65.2
Eff Velocity (avg)
2,504
Spin Rate (max)
2,324
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - ChangeUp
72.4
Velocity (max)
72.0 - 72.4
Velo Range
72.0
Eff Velocity (avg)
1,890
Spin Rate (max)
1,687
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
2025
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
2024
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
81.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
79.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
72.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
67.0
Game Performance
2025
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.58
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
3.78
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
6.83
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.
Tampa Preseason ID
Dec 23, 2025
Vald
1.58
10-yd
3.78
30-yd
6.83
60-yd
20.1
Run speed (max)
1.52
RSI (max)
24.3
Jump Height (max)
Vizual Edge
Pitch Ai
Notes
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Comments
Draft Reports
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Physical
2025
2024
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.
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.
Positional Profile: OF/RHP
Body: 5-8, 141-pounds. Light, athletic frame. Room for growth.
Arm Action: RH
FB: T81, 78-80 mph. T2268, 2153 average rpm.
SL: 66-68 mph. T2504, 2324 average rpm.
CH: 72-72 mph. T1890, 1687 average rpm.
ATH: 7.22 runner in the 60.
Positional Profile: OF/RHP
Body: 5-8, 141-pounds. Light, athletic frame. Room for growth.
Hit: RHH. Tall, narrow stance. Long stride, uphill path. Loose hands, line drive gap-to-gap approach.
Arm: RH. INF-78 mph. OF-81 mph. Full 3/4 arm action, repeatable.
Defense: Athletic action with soft hands.
ATH: 7.22 runner in the 60.