23.5
Hand Speed (max)
6/24/25
CLASS OF 2028
3B
RHP
Dean
Mierzwa
North Salem (HS) • NY
5' 10" • 185.4LBS
L/R • 14yr 8mo
Travel Team: East Coast Athletics
5' 10" • 185.4LBSL/R • 14yr 8mo
Travel Team: East Coast Athletics
Rankings
2028 National
Rankings available to Premium Subscriber
2028 State
Rankings available to Premium Subscriber
Commitment
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Best Of Stats
70.3
Bat Speed (max)
6/24/25
10.4
Rot. Acc (max)
6/24/25
-
Hard Hit %
85.5
Exit Velocity (max)
6/24/25
75.6
Exit Velocity (avg)
2/20/25
280
Distance (max)
2/20/25
55
Sweet Spot %
2/20/25
8.51
60-yd
6/24/25
4.60
30-yd
6/24/25
1.94
10-yd
6/24/25
15.7
Run speed (max)
6/24/25
67
INF Velo
2/20/25
-
OF Velo
-
C Velo
-
Pop Time
Fastball
71.1
Velocity (max)
6/24/25
68 - 70
Velo Range
6/24/25
1808
Spin Rate (avg)
6/24/25
Curveball
61.7 - 62.3
Velo Range
6/24/25
1684
Spin Rate (avg)
6/24/25
Positional Tools
2025
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
8.51
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
67.0
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.
10.0
Hitting
2025
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
85.5
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
75.4
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
280
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
138
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
12.5901
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.
2025 NYS Games Session 1 (AM)
Jun 24, 2025
Trackman - Hitting
85.5
Exit Velocity (max)
75.1
Exit Velocity (avg)
130
Distance (avg)
262
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2025 NY Preseason ID: Downstate (Session 1)
Feb 20, 2025
Trackman - Hitting
83.4
Exit Velocity (max)
75.6
Exit Velocity (avg)
145
Distance (avg)
280
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2025
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
23.5
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
21.1
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
70.3
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
65.2
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.
2025 NYS Games Session 1 (AM)
Jun 24, 2025
Blast - Hitting
23.5
Hand Speed (max)
21.2
Hand Speed (avg)
70.3
Bat Speed (max)
66.9
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2025 NY Preseason ID: Downstate (Session 1)
Feb 20, 2025
Blast - Hitting
22.6
Hand Speed (max)
21.0
Hand Speed (avg)
68.4
Bat Speed (max)
63.8
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
71.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
69.0
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).
1808
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.
26.2
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).
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
62.0
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).
1684
Curveball
Total Movement Avg
The average total non-gravity movement for all pitches of this type in the given event year. Measured in inches (in).
2025 NYS Games Session 1 (AM)
Jun 24, 2025
Trackman - Fastball
71.1
Velocity (max)
68.0 - 70.0
Velo Range
66.4
Eff Velocity (avg)
1,888
Spin Rate (max)
1,808
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Curveball
62.3
Velocity (max)
61.7 - 62.3
Velo Range
59.3
Eff Velocity (avg)
1,779
Spin Rate (max)
1,684
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
Pitching Velos
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
71.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
69.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
62.0
Game Performance
2025
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.94
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.6
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
8.51
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.
2025 NYS Games Session 1 (AM)
Jun 24, 2025
Vald
1.94
10-yd
4.60
30-yd
8.51
60-yd
15.7
Run speed (max)
0.84
RSI (max)
15.6
Jump Height (max)
Vizual Edge
2025
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.
65.49
Pitch Ai
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Physical
2025
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.