22.6
Hand Speed (max)
3/05/23
CLASS OF 2025
SS
RHP
Sam
Kemmer
Johnston (HS) • IA
6' 2" • 210LBS
R/R • 17yr 3mo
Travel Team: IA PG Select
6' 2" • 210LBS
R/R • 17yr 3mo
Travel Team: IA PG Select
Rankings
2025 National
Rankings available to Premium Subscriber
2025 State
Rankings available to Premium Subscriber
Commitment
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Best Of Stats
74.4
Bat Speed (max)
3/06/22
11
Rot. Acc (max)
3/06/22
-
Hard Hit %
93.5
Exit Velocity (max)
3/05/23
86.5
Exit Velocity (avg)
3/05/23
338
Distance (max)
8/30/23
71
Sweet Spot %
8/30/23
7.78
60
8/30/23
-
30-yd
-
10-yd
-
Run speed (max)
87
INF Velo
3/05/23
87
OF Velo
8/30/23
-
C Velo
-
Pop Time
Fastball
86.2
Velocity (max)
3/05/23
82.9 - 85.2
Velo Range
3/05/23
2266
Spin Rate (avg)
3/05/23
Changeup
68.7 - 72.9
Velo Range
5/01/22
1413
Spin Rate (avg)
5/01/22
Curveball
63.8 - 68.7
Velo Range
5/01/22
2117
Spin Rate (avg)
5/01/22
Slider
71.2 - 73.6
Velo Range
3/05/23
2259
Spin Rate (avg)
3/05/23
Positional Tools
2023
2022
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.78
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
87.0
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
87.0
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.
12.0
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
8.34
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
82.0
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.
10.6
Hitting
2023
2022
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
93.5
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
85.3
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
338
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
223
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
26.9
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).
88.3
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).
269
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
136
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
7.8
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.
PBR IA Scout Day- Iowa Sticks
Aug 30, 2023
Trackman - Hitting
92.9
Exit Velocity (max)
83.8
Exit Velocity (avg)
250
Distance (avg)
338
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
PBR IA Preseason All-State (Invite Only)
Mar 5, 2023
Trackman - Hitting
93.5
Exit Velocity (max)
86.5
Exit Velocity (avg)
198
Distance (avg)
316
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
PBR IA Preseason All-State (Invite Only)
Mar 6, 2022
Trackman - Hitting
88.3
Exit Velocity (max)
84.3
Exit Velocity (avg)
136
Distance (avg)
269
Distance (max)
Sweet Spot %
Line Drive %
Ground Ball %
Hitting
2023
2022
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
22.6
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
21.8
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
70.0
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
66.6
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.
20.7
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
20.0
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
74.4
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
67.6
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.
PBR IA Preseason All-State (Invite Only)
Mar 5, 2023
Blast - Hitting
22.6
Hand Speed (max)
21.8
Hand Speed (avg)
70.0
Bat Speed (max)
66.6
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
PBR IA Preseason All-State (Invite Only)
Mar 6, 2022
Blast - Hitting
20.7
Hand Speed (max)
20.1
Hand Speed (avg)
74.4
Bat Speed (max)
67.7
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2023
2022
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
86.2
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
84.0
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).
2266
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.
27.0
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
70.8
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).
1373
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).
72.0
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).
2259
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).
83.2
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
80.2
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).
2116
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.
26.4
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).
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
66.2
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).
2090
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).
69.1
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).
1330
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).
69.7
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).
1779
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).
PBR IA Preseason All-State (Invite Only)
Mar 5, 2023
Trackman - Fastball
86.2
Velocity (max)
82.9 - 85.2
Velo Range
81.6
Eff Velocity (avg)
2,348
Spin Rate (max)
2,266
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Slider
74.9
Velocity (max)
71.2 - 73.6
Velo Range
70.2
Eff Velocity (avg)
2,334
Spin Rate (max)
2,259
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
73.8
Velocity (max)
69.4 - 72.6
Velo Range
69.4
Eff Velocity (avg)
1,464
Spin Rate (max)
1,373
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
PBR IA Summer Launch- Central Iowa
May 1, 2022
Trackman - Fastball
83.2
Velocity (max)
80.8 - 82.5
Velo Range
79.9
Eff Velocity (avg)
2,216
Spin Rate (max)
2,102
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
69.6
Velocity (max)
63.8 - 68.7
Velo Range
64.1
Eff Velocity (avg)
2,260
Spin Rate (max)
2,117
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - Slider
73.1
Velocity (max)
67.5 - 72.6
Velo Range
68.2
Eff Velocity (avg)
2,150
Spin Rate (max)
1,779
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
72.9
Velocity (max)
68.7 - 72.9
Velo Range
69.4
Eff Velocity (avg)
2,157
Spin Rate (max)
1,413
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
PBR IA Preseason All-State (Invite Only)
Mar 6, 2022
Trackman - Fastball
80.4
Velocity (max)
76.8 - 80.4
Velo Range
76.9
Eff Velocity (avg)
2,174
Spin Rate (max)
2,130
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
68.5
Velocity (max)
64.5 - 68.1
Velo Range
64.6
Eff Velocity (avg)
2,169
Spin Rate (max)
2,064
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
68.2
Velocity (max)
66.4 - 68.2
Velo Range
66.1
Eff Velocity (avg)
1,405
Spin Rate (max)
1,247
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Pitch Scores
2023
Fastball
Hop+
A fastball with hop has a flat approach angle and visually jumps through the zone. When thrown up in the zone, it is more likely to generate a higher swing and miss average. Hop+ of 100 is MLB average.
Fastball
Sink+
A fastball with sink has low backspin and drops through the strike zone. When thrown down in the zone, it is more likely to generate a higher ground ball percentage and lower launch angle. Sink+ of 100 is MLB average.
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
Game Performance
Visual Edge
Pitch Ai
2022
Arm Speed
The maximum speed, in the direction of home plate, that the wrist is traveling. Measured in meters per second (m/s)
Arm Slot
Angle of the forearm relative to the ground between maximum external rotation (MER) and ball release (BR). Which can be a powerful player comparison metric, delivered in degrees.
Knee Extension Velo
The angular velocity of the front knee straightening after foot plant, which provides indicators of velocity potential. Measured in degrees per second.
Deception
The amount of time that the ball is visible to the hitter, after the instant of front foot strike. Measures in milliseconds.
Hip-Shoulder Separation
The difference in angle of between the hips and shoulders, occurring close to the foot plant. Measured in degrees.
PBR IA Preseason All-State (Invite Only)
Mar 6, 2022
ProPlayAI - Foot Plant
Elbow Flexion (avg)
Shoulder Abduction (avg)
Hip Shoulder Seperation (avg)
ProPlayAI - MER
External Rotation (avg)
Stride Length (avg)
Horizontal Abduction (avg)
ProPlayAI - Release
Arm Speed (max)
Arm Speed (avg)
Knee Extension Velocity (max)
Knee Extension Velocity (avg)
Knee Flexion (avg)
Arm Slot (avg)
Lateral Trunk Tilt (avg)
Arm Path (avg)
Deception (avg)
Torque (avg)
Efficiency (avg)
Sequencing (avg)
Notes
News
- PBR IA Summer Launch- Central Iowa: Pitcher Reports - Jun 1, 2022
- PBR Iowa Summer Launch- Central Iowa: Instant Analysis (2022 & 2023 Grads) - May 3, 2022
- PBR Iowa Summer Launch- Central Iowa: Instant Analysis (2024 & 2025 Grads) - May 3, 2022
- PBR IA Preseason All-State: Scouting Reports- Pitchers - Apr 14, 2022
- PBR IA Preseason All-State: Scouting Reports- Infielders - Apr 13, 2022
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Positional Profile: SS/RHP
Body: 6_2, 210-pounds.
Defense: INF - 87 mph. Works low to ground with hands out front, solid overall fielding actions, throws have carry and accuracy to target.
Hit: RHH. Slight body load with quiet hands, some length to zone with slight arm bar, line drive swing plane, works to stay on and through contact, flashes of pop in bat.
Power: 93.50 mph max Trackman exit velocity in bp.
Run: 7.89 runner in the 60.
Delivery: Controlled medium balance point, swings down mound, slight upright finish.
Arm Action: RH. Short clean compact arm action from ¾ slot.
FB: T86.20, 82.9-85.2 mph. Late cutting action with occasional life through upper half of zone.
SL: 71.2-73.6 mph. Drops elbow at times; flashes sharp 11/5 break with depth when on top.
CH: 69.4-72.6 mph. Late diving fade action to arm side of plate.
Positional Profile: RHP
Body: 6-1, 190-pounds.
Delivery: ¾ start into up tempo higher square balance point, lands inline to catcher, quick and aggressive down mound with extension and finish to plate.
Arm Action: RH. Clean arm circle with above avg. hand quickness; ¾ slot.
FB: T83.2, 80.8-82.5 mph. T2216, 2102 average rpm.
CB: 63.8-68.7 mph. T2259, 2116 average rpm.
SL: 67.5-72.6 mph. T2149, 1778 average rpm.
CH: 68.7-72.9 mph. T2157, 1413 average rpm.
Positional Profile: SS/RHP
Body: 6-0, 180-pounds.
Hit: RHH. Open stance, knee to knee trigger, length to contact, straight arm bar load, flat swing plane, works out front to contact, flashes above avg. strength for age with pop in bat.
Power: 88.3 max exit velocity, averaged 84.3 mph. 268’ max distance.
Arm: RH. INF - 82 mph.
Defense: Arm works well and is above avg. across infield, appropriate footwork, fields under body at times, has actions to field and is a follow moving forward.
Run: 8.34 runner in the 60.
Delivery: Full turn, shows rhythm and coordination, lands inline, solid extension out front.
Arm Action: RH. Clean arm path from high ¾ slot.
FB: T80.4, 76.8-80.4 mph. T2173, 2129 average rpm. Heavy action with slight run.
CB: 64.5-68.1 mph. T2168, 2063 average rpm. 10/4 shape; solid horizontal break.
CH: 66.4-68.2 mph. T1404, 1246 average rpm. Usable with late sinking action.