-
Hand Speed (max)
CLASS OF 2029
OF
LHP
WILLIAM
KOWALSKI
Marquette (HS) • WI
5' 9" • 190LBS
R/L • 15yr 10mo
Travel Team: Prospects 15U Volman
5' 9" • 190LBSR/L • 15yr 10mo
Travel Team: Prospects 15U Volman
Rankings
2029 National
Rankings available to Premium Subscriber
2029 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
-
Bat Speed (max)
-
Rot. Acc (max)
10
Hard Hit %
6/23/26
90.9
Exit Velocity (max)
6/23/26
82.9
Exit Velocity (avg)
6/23/26
303
Distance (max)
6/23/26
10
Sweet Spot %
6/23/26
8.81
60-yd
6/23/26
4.76
30-yd
6/23/26
1.98
10-yd
6/23/26
15.2
Run speed (max)
6/23/26
-
INF Velo
69
OF Velo
6/23/26
-
C Velo
-
Pop Time
Fastball
74
Velocity (max)
6/23/26
72 - 74
Velo Range
6/23/26
1948
Spin Rate (avg)
6/23/26
Changeup
68 - 70
Velo Range
6/23/26
1540
Spin Rate (avg)
6/23/26
Curveball
65.9 - 66
Velo Range
6/23/26
1773
Spin Rate (avg)
6/23/26
Slider
66 - 67
Velo Range
6/23/26
1964
Spin Rate (avg)
6/23/26
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)
8.81
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
69.0
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.
10.3
Hitting
2026
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
90.9
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
82.9
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
303
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
128
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
9.3649
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.
Milwaukee Summer ID
Jun 23, 2026
Trackman - Hitting
90.9
Exit Velocity (max)
82.9
Exit Velocity (avg)
128
Distance (avg)
303
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
Pitching
2026
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
73.8
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
73.1
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).
1948
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.
26.6
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
65.9
Curveball
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).
1773
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
68.6
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).
1540
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
66.4
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).
1964
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).
Milwaukee Summer ID
Jun 23, 2026
Trackman - Fastball
73.8
Velocity (max)
72.4 - 73.8
Velo Range
70.4
Eff Velocity (avg)
1,984
Spin Rate (max)
1,948
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Curveball
66.0
Velocity (max)
65.9 - 66.0
Velo Range
63.0
Eff Velocity (avg)
1,810
Spin Rate (max)
1,773
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Slider
66.7
Velocity (max)
65.9 - 66.7
Velo Range
61.7
Eff Velocity (avg)
2,071
Spin Rate (max)
1,964
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
69.5
Velocity (max)
67.6 - 69.5
Velo Range
66.0
Eff Velocity (avg)
1,625
Spin Rate (max)
1,540
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Pitch Scores
Pitching Velos
2026
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
74.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
73.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
66.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
69.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
66.5
Game Performance
2026
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.98
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.76
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
8.81
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
Vizual Edge
2026
Edge Score
The highest Edge Score within the given year. Edge Score is a comprehensive score that takes the core-six visual skills into account, providing an assessment of an athlete’s overall visual ability.
71.86
Pitch Ai
Notes
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Comments
Draft Reports
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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.