@Zach_Koslowski 83.1
Velocity (max)
6/16/26
CLASS OF 2027
RHP
3B
Zachary
Koslowski
Barrow Arts and Sciences Academy (HS) • GA
5' 9" • 180LBS
R/R • 17yr 2mo
Travel Team: GBSA Rays
5' 9" • 180LBS
R/R • 17yr 2mo
Travel Team: GBSA Rays
Rankings
2027 National
Rankings available to Premium Subscriber
2027 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
Fastball
82.5 - 83
Velo Range
6/16/26
1994
Spin Rate (avg)
6/16/26
Changeup
71.9 - 73.1
Velo Range
6/16/26
1266
Spin Rate (avg)
6/16/26
Curveball
68 - 72
Velo Range
9/26/25
2094
Spin Rate (avg)
6/16/26
Slider
72.5 - 74.7
Velo Range
6/16/26
1905
Spin Rate (avg)
6/16/26
Positional Tools
Hitting
Hitting
Pitching
2026
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Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
83.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
82.8
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).
1994
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.
24.1
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).
71.2
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).
2094
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
72.5
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).
1266
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).
73.6
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).
1905
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).
Knuckleball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
69.8
Knuckleball
Total Movement Avg
The average total non-gravity movement for all pitches of this type in the given event year. Measured in inches (in).
Athens Summer ID
Jun 16, 2026
Trackman - Fastball
83.1
Velocity (max)
82.5 - 83.0
Velo Range
80.8
Eff Velocity (avg)
2,071
Spin Rate (max)
1,994
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
72.0
Velocity (max)
70.9 - 71.7
Velo Range
69.4
Eff Velocity (avg)
2,122
Spin Rate (max)
2,094
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
75.3
Velocity (max)
72.5 - 74.7
Velo Range
71.8
Eff Velocity (avg)
2,339
Spin Rate (max)
1,905
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
73.2
Velocity (max)
71.9 - 73.1
Velo Range
70.9
Eff Velocity (avg)
1,442
Spin Rate (max)
1,266
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Knuckleball
70.2
Velocity (max)
69.4 - 70.2
Velo Range
68.0
Eff Velocity (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Zone %
Pitch Scores
Pitching Velos
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
78.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
76.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
70.0
Game Performance
Vizual Edge
Pitch Ai
Notes
News
Comments
Draft Reports
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