72.6
Velocity (max)
6/02/26
CLASS OF 2029
RHP
Mason
Kiemeney
Ontario Christian (HS) • CA
6' 2" • 154.1LBS
R/R • 15yr 8mo
Travel Team: GBG IE 2029
6' 2" • 154.1LBSR/R • 15yr 8mo
Travel Team: GBG IE 2029
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
70.7 - 72.6
Velo Range
6/02/26
1649
Spin Rate (avg)
6/02/26
Changeup
65.3 - 68.9
Velo Range
6/02/26
1797
Spin Rate (avg)
6/02/26
Curveball
61.2 - 62.7
Velo Range
6/02/26
1734
Spin Rate (avg)
6/02/26
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).
72.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
71.7
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).
1649
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.
23.0
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).
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).
1734
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).
67.1
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).
1797
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).
Inland Empire Summer ID
Jun 2, 2026
Trackman - Fastball
72.6
Velocity (max)
70.7 - 72.6
Velo Range
71.3
Eff Velocity (avg)
1,712
Spin Rate (max)
1,649
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
62.7
Velocity (max)
61.2 - 62.7
Velo Range
60.3
Eff Velocity (avg)
1,769
Spin Rate (max)
1,734
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)
65.3 - 68.9
Velo Range
67.3
Eff Velocity (avg)
1,912
Spin Rate (max)
1,797
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
Game Performance
Vizual Edge
Pitch Ai
Notes
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Comments
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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.