Prep Baseball Report

CLASS OF 2024

RHP
OF

Jack
Stemerman

Elmira (HS) • NY
5' 10" • 150.6LBS
L/R • 22yr 1mo
Travel Team: Seneca Allstars 17u

Rankings

2024 National

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2024 State

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Commitment

Videos

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Best of Snapshot
Physical
Positional Tools Velos / Pop
TrackMan Hitting
Blast
TrackMan Pitching
Pitch Scores
Pitching Velos
Swift
Visual Edge
PitchAI
Comments
Twitter
Contact

Best Of Stats

Pitching

Fastball

80.1
Velocity (max)
2/11/23
79.5 - 79.9
Velo Range
2/11/23
1852
Spin Rate (avg)
6/26/23

Changeup

76.4 - 77
Velo Range
2/11/23
1441
Spin Rate (avg)
6/29/22

Curveball

67.3 - 68.8
Velo Range
10/30/21
1683
Spin Rate (avg)
10/30/21

Slider

71.1 - 71.8
Velo Range
6/26/23
1935
Spin Rate (avg)
6/26/23
Power
86
Exit Velocity (max)
2/11/23
80.7
Exit Velocity (avg)
2/21/22
316
Distance (max)
2/21/22
78
Sweet Spot %
6/29/22
Hitting
22.4
Hand Speed (max)
6/26/23
73.5
Bat Speed (max)
6/26/23
23.4
Rot. Acc (max)
2/11/23
-
Hard Hit %
Run
7.28
60
6/26/23
4.06
30-yd
6/26/23
1.75
10-yd
2/11/23
19.1
Run speed (max)
6/26/23
Defense
-
INF Velo
83
OF Velo
2/11/23
-
C Velo
-
Pop Time

Positional Tools

2023
2022
2021
2020
Outfield Velocity
83.0
60 Yard Dash
7.66
Outfield Velocity
77.0
Power / Speed Score
11.1
60 Yard Dash
7.72
Outfield Velocity
75.0
Power / Speed Score
10.7
60 Yard Dash
7.56
Home to First
4.53
Outfield Velocity
63.0
Power / Speed Score
9.8
2023 NYS Games Session 1
Jun 26, 2023
Position
77
OF Velo
Power Speed Score
2023 Preseason ID: Central
Feb 11, 2023
Position
83
OF Velo
Power Speed Score
2022 NYS Games (Session 2)
Jun 29, 2022
Position
74
OF Velo
Power Speed Score
2021 Last Chance Fall Prospect Showcase
Oct 30, 2021
Position
7.72
60-yard
75
OF Velo
83
Exit Velo
2020 Jr. NYS Games Trials - Upstate
Mar 1, 2020
Position
7.56
60-yard
63
OF Velo
74
Exit Velo
4.53
H-1st

Hitting

2023
2022
2021
Exit Velocity Max
86.0
Exit Velocity Avg
76.2
Distance Max
277
Distance Avg
128
Launch Angle Avg
11.6
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Exit Velocity Max
85.0
Exit Velocity Avg
78.5
Distance Max
316
Distance Avg
234
Launch Angle Avg
24.2
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Exit Velocity Max
82.5
Exit Velocity Avg
75.0
Distance Max
294
Distance Avg
203
Launch Angle Avg
27.2
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2023 NYS Games Session 1
Jun 26, 2023
Trackman - Hitting
83.6
Exit Velocity (max)
78.2
Exit Velocity (avg)
115
Distance (avg)
277
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2023 Preseason ID: Central
Feb 11, 2023
Trackman - Hitting
86.0
Exit Velocity (max)
74.8
Exit Velocity (avg)
138
Distance (avg)
221
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2022 NYS Games (Session 2)
Jun 29, 2022
Trackman - Hitting
84.8
Exit Velocity (max)
76.9
Exit Velocity (avg)
229
Distance (avg)
281
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2022 Elite Baseball Scout Day (Summer)
Jun 4, 2022
Trackman - Hitting
83.4
Exit Velocity (max)
78.2
Exit Velocity (avg)
222
Distance (avg)
287
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2022 Preseason All-State - Central
Feb 21, 2022
Trackman - Hitting
85.0
Exit Velocity (max)
80.7
Exit Velocity (avg)
252
Distance (avg)
316
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
2021 Last Chance Fall Prospect Showcase
Oct 30, 2021
Trackman - Hitting
82.5
Exit Velocity (max)
75.0
Exit Velocity (avg)
203
Distance (avg)
294
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %

Hitting

2023
2022
Hand Speed Max
22.4
Hand Speed Avg
20.9
Bat Speed Max
73.5
Bat Speed Avg
67.1
Rotational Acceleration Max
Rotational Acceleration Avg
On-Plane Efficiency Max
On-Plane Efficiency Avg
Hand Speed Max
21.9
Hand Speed Avg
19.6
Bat Speed Max
67.3
Bat Speed Avg
61.8
Rotational Acceleration Max
Rotational Acceleration Avg
On-Plane Efficiency Max
On-Plane Efficiency Avg
2023 NYS Games Session 1
Jun 26, 2023
Blast - Hitting
22.4
Hand Speed (max)
21.4
Hand Speed (avg)
73.5
Bat Speed (max)
67.8
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2023 Preseason ID: Central
Feb 11, 2023
Blast - Hitting
21.8
Hand Speed (max)
20.4
Hand Speed (avg)
67.4
Bat Speed (max)
66.3
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2022 NYS Games (Session 2)
Jun 29, 2022
Blast - Hitting
21.9
Hand Speed (max)
20.1
Hand Speed (avg)
63.8
Bat Speed (max)
59.7
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2022 Elite Baseball Scout Day (Summer)
Jun 4, 2022
Blast - Hitting
20.9
Hand Speed (max)
19.8
Hand Speed (avg)
64.5
Bat Speed (max)
62.7
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2022 Preseason All-State - Central
Feb 21, 2022
Blast - Hitting
19.8
Hand Speed (max)
18.7
Hand Speed (avg)
67.3
Bat Speed (max)
63.5
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency

Pitching

2023
2022
2021
Fastball
Velocity Max
80.1
Fastball
Velocity Avg
78.6
Fastball
Spin Rate Avg
1840
Fastball
Spin Score Avg
23.4
Fastball
Total Movement Avg
Changeup
Velocity Avg
75.8
Changeup
Spin Rate Avg
1151
Changeup
Total Movement Avg
Slider
Velocity Avg
70.1
Slider
Spin Rate Avg
1921
Slider
Total Movement Avg
Fastball
Velocity Max
76.8
Fastball
Velocity Avg
74.4
Fastball
Spin Rate Avg
1697
Fastball
Spin Score Avg
22.8
Fastball
Total Movement Avg
Changeup
Velocity Avg
71.0
Changeup
Spin Rate Avg
1382
Changeup
Total Movement Avg
Slider
Velocity Avg
67.3
Slider
Spin Rate Avg
1818
Slider
Total Movement Avg
Fastball
Velocity Max
74.4
Fastball
Velocity Avg
73.5
Fastball
Spin Rate Avg
1700
Fastball
Spin Score Avg
23.2
Fastball
Total Movement Avg
Curveball
Velocity Avg
68.2
Curveball
Spin Rate Avg
1683
Curveball
Total Movement Avg
Changeup
Velocity Avg
68.4
Changeup
Spin Rate Avg
1220
Changeup
Total Movement Avg
2023 NYS Games Session 1
Jun 26, 2023
Trackman - Fastball
78.9
Velocity (max)
77.3 - 78.7
Velo Range
75.2
Eff Velocity (avg)
1,916
Spin Rate (max)
1,852
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
71.8
Velocity (max)
71.1 - 71.8
Velo Range
67.7
Eff Velocity (avg)
1,992
Spin Rate (max)
1,935
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
75.3
Velocity (max)
74.5 - 75.3
Velo Range
72.7
Eff Velocity (avg)
1,226
Spin Rate (max)
1,155
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
2023 Preseason ID: Central
Feb 11, 2023
Trackman - Fastball
80.1
Velocity (max)
79.5 - 79.9
Velo Range
76.4
Eff Velocity (avg)
2,014
Spin Rate (max)
1,820
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Slider
67.6
Velocity (max)
67.0 - 67.6
Velo Range
63.8
Eff Velocity (avg)
1,928
Spin Rate (max)
1,900
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
77.0
Velocity (max)
76.4 - 77.0
Velo Range
73.5
Eff Velocity (avg)
1,205
Spin Rate (max)
1,147
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
2022 NYS Games (Session 2)
Jun 29, 2022
Trackman - Fastball
75.4
Velocity (max)
73.1 - 74.7
Velo Range
70.7
Eff Velocity (avg)
2,030
Spin Rate (max)
1,711
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
72.6
Velocity (max)
70.4 - 72.2
Velo Range
68.3
Eff Velocity (avg)
1,594
Spin Rate (max)
1,441
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
2022 Elite Baseball Scout Day (Summer)
Jun 4, 2022
Trackman - Fastball
75.1
Velocity (max)
73.4 - 75.0
Velo Range
71.8
Eff Velocity (avg)
1,968
Spin Rate (max)
1,678
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Slider
66.7
Velocity (max)
66.0 - 66.7
Velo Range
63.0
Eff Velocity (avg)
1,915
Spin Rate (max)
1,848
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
71.2
Velocity (max)
1,184
Spin Rate (max)
1,184
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
2022 Preseason All-State - Central
Feb 21, 2022
Trackman - Fastball
76.8
Velocity (max)
75.9 - 76.6
Velo Range
73.6
Eff Velocity (avg)
1,763
Spin Rate (max)
1,675
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - Slider
69.4
Velocity (max)
68.9 - 69.4
Velo Range
1,784
Spin Rate (max)
1,759
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
72.0
Velocity (max)
69.4 - 71.8
Velo Range
67.2
Eff Velocity (avg)
1,643
Spin Rate (max)
1,357
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
2021 Last Chance Fall Prospect Showcase
Oct 30, 2021
Trackman - Fastball
74.4
Velocity (max)
72.5 - 74.4
Velo Range
72.1
Eff Velocity (avg)
1,800
Spin Rate (max)
1,700
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
68.8
Velocity (max)
67.3 - 68.8
Velo Range
68.0
Eff Velocity (avg)
1,695
Spin Rate (max)
1,683
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
69.8
Velocity (max)
66.9 - 69.8
Velo Range
67.7
Eff Velocity (avg)
1,722
Spin Rate (max)
1,220
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %

Pitch Scores

2023
2021
Fastball
Hop+
Fastball
Sink+
Fastball
Rise+
Fastball
Hop+
Fastball
Sink+
Fastball
Rise+
2023 NYS Games Session 1
Jun 26, 2023
Pitch Scores - Fastball
Hop+
Rise+
Sink+
2021 Last Chance Fall Prospect Showcase
Oct 30, 2021
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+

Pitching Velos

2022
2020
Fastball
Velocity Max
75.0
Fastball
Velocity Max
70.0
Fastball
Velocity Avg
69.0
Changeup
Velocity Avg
62.5

Game Performance

2024
2023
2022
10 Yard Dash
1.75
30 Yard Dash
4.06
60 Yard Dash
7.28
Top Speed (MPH)
RSi
10 Yard Dash
1.75
30 Yard Dash
4.06
60 Yard Dash
7.28
Top Speed (MPH)
10 Yard Dash
1.83
30 Yard Dash
4.14
60 Yard Dash
7.47
Top Speed (MPH)
RSi
2023 NYS Games Session 1
Jun 26, 2023
Swift
1.77
10-yd
4.06
30-yd
7.28
60-yd
19.1
Run speed (max)
2023 Preseason ID: Central
Feb 11, 2023
Swift
1.75
10-yd
4.08
30-yd
7.39
60-yd
18.5
Run speed (max)
2022 NYS Games (Session 2)
Jun 29, 2022
Swift
1.83
10-yd
4.14
30-yd
7.47
60-yd
18.5
Run speed (max)
8.0
Run Speed (avg)
2.69
RSi (max)
2.69
RSi (avg)
1,255
Jump Power (max)
19.2
Jump Height (max)
18.5
Jump Height (avg)

Visual Edge

2023
2022
Edge Score
76.78
Edge Score
66.65

Pitch Ai

2022
Arm Speed
Arm Slot
Knee Extension Velo
Deception
Hip-Shoulder Separation
2022 NYS Games (Session 2)
Jun 29, 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

Comments

6/26/23

Physical: 5-10, 170 pounds; Proportional, slender build. 7.28 runner in the 60.

Offensively: LHH. Even setup, with feet shoulder width apart; has a pre-pitch bat waggle. Lifts hands with an up and down stride for timing. Drifts into contact while showing an average effort from the legs. Showed a direct swing path with a finish around the back.  More groundballs than line drives and flyballs with a peak exit velocity of 84 MPH via Trackman.

Defensively: Starts with a balanced setup; walks into ready position while utilizing a quick first step. Hands are off to the side with a clean transfer. Long arm swing from a high 3/4 arm slot.  OF - 77 MPH.

Pitching
: Uses a glove side setup working primarily from the stretch. Belt high leg drive with shoulders outside the hips. Has a moderate stride while landing open. Moderate arm swing while arm stays in line with 2B; standard 3/4 slot. Spins off 1B side with finish. FB: Peak velo of 80 MPH, while sitting  MPH; arm side run. CB: 67-68 MPH. SL: 71 MPH; short action. CH: 76-77 MPH; maintains same plain.

2/11/23

Physical: 5-foot-10, 170 pounds; Athletic, slight build. 7.39 runner in the 60.

Offensively: LHH. Even setup, with feet just outside his shoulders; flat bat to start. Short take back with the hands with a toe-tap for timing. Stays behind the ball while showing a strong lower half. Showed a slight lift to the ball with a late one hand finish.  More line drives than flyballs and groundballs with a peak exit velocity of 86 MPH via Trackman. Displayed good rotational acceleration parlayed with the ability to get on plane early.

Defensively: Starts with a low to the ground setup; uses prep hop while being aggressive. Hands are off to the side with a clean transfer. Moderate arm circle from a standard 3/4 arm slot.  OF - 83 MPH.

Pitching
: Uses a center rubber setup working primarily from the stretch. Mid chest leg drive with a slight lean over the belt. Has a long stride landing inline with the plate. Long arm swing while showing effortless and fluid actions; standard 3/4 slot. Spins off 1B side with finish. FB: Peak velo of 80 MPH, while sitting 79-80 MPH; commands both sides.  SL: 67-68 MPH; tilting break. CH: 76-77 MPH; fading action.  Displayed a good change up living in the lower part of the zone.


6/29/22

Physical: 5-foot-10, 170 pounds; Lean, average build. 7.47 runner in the 60.

Offensively: LHH. Open setup, with feet just outside his shoulders; upright bat position. Short take back with the hands with an up and down stride for timing. Stays behind the ball while showing a strong lower half. Showed a direct swing path with a two handed finish.  More flyballs than line drives and groundballs with a peak exit velocity of 85 MPH via Trackman. Above average sweet spot %.

Defensively: Starts with a compact setup; walks into ready position while showing active feet. Hands are out in front while funneling to the hip before transfer. Long arm swing from a low 3/4 arm slot. OF - 74 MPH.

Pitching: Uses an arm side setup while using a side step. Belt high leg drive with shoulders above the hips. Has a moderate stride while landing slightly closed. Long arm swing while arm stays in line with 2B; low 3/4 slot. Square to the plate with finish. FB: Peak velo of 75 MPH, while sitting 73-75 MPH; straight action.  CH: 70-73 MPH; maintains the same plain.

2/21/22

Physical: 5-foot-10, 155 pounds; Lean build. 7.66 runner in the 60.

Offensively: LHH. Even setup, with feet just outside his shoulders; has a pre-pitch bat waggle. Short take back with the hands with an up and down stride for timing. Stays behind the ball while showing a strong lower half. Showed a short swing path with a two handed finish.  More fly balls than line drives and ground balls with a peak exit velocity of 85 MPH via Trackman. good feel for the barrel (75% sweet spot).

Defensively: Starts with a balanced setup; uses prep step while showing active feet. Hands are off to the side while funneling to the hip before transfer. Long arm swing from a standard 3/4 arm slot.  OF - 77 MPH.

Pitching: Uses a glove side setup while using a side step. Mid chest leg drive with shoulders above the hips. Has a long stride landing inline with the plate. Long arm swing while arm stays in line with 2B; standard 3/4 slot. Square to the plate with finish. 

10/30/21

Physical: Wiry, lengthy 5-foot-10, 155lb frame. 7.72 runner in the 60-yard dash.

Offensively: LHH - Crouched, open stance with the hands starting up/down, low over the plate. Utilized a gather load back up to the shoulder, stacked on the backside as he delivered the barrel through a flat, direct path into the hitting zone. Produced solid direction in the swing with ability to extend through contact towards a high two-handed finish. Recorded a lofty approach to the middle, pull-side of the field (57% fly ball rate via Trackman) en route to a near 300 foot peak distance (doubles power). Good connection and bat to ball skills offensively. 

Defensively: The outfielder displayed an up-tempo attack, getting over the toes and racing downhill to the baseball. Fielded off his left from a solid base, crow hopping in a pronounced fashion towards the plate. Exchanged to the throwing ear cleanly, releasing with moderate length out of a ¾ slot (75 mph arm). 

Pitching: RHP - Set up off the glove side of the rubber slightly offset, using quick pace in the delivery. Landed into a firm, fast front-side as it connected to the ground, using an explosive move to release downhill from a H ¾ slot (leveraged). The FB ranged from 72-74 mph with efficient, repeatable actions, landing a short, lateral 67-69 mph CB for strikes with up to 7 inches of HM. Added a well-killed 68-70 mph CH with some fade to the arm-side at 1220rpms.


3/01/20

Physical: Lean build with room to grow. 7.56 runner in the 60; 4.53 home-to-1B.
Offensively: LHH. Starts bat out front, wide stance, high leg kick. Quick hands through zone, pull-side hitter, generates a powerful swing. Contact hitter to pull-side. 74 MPH raw exit velocity.
Defensively: Fields ball to the side, attacks ball, consistent footwork, accurate throw. 3/4 arm slot.  OF - 63 MPH.
Pitching: Works up tempo with a quick sidestep and high leg kick, gets into back leg and keeps shoulders in line getting to a repeatable release and follow through. Long, fast arm swing to a clean 3/4 release. FB: T70, 68-70 MPH. Has life out of the hand with arm side run.  CH: 61-64 MPH. Keeps hand speed, fades down to arm side. 

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Physical

2024
2023
Grip Strgth (LH)
Grip Strgth (RH)
Grip Strgth (LH)
Grip Strgth (RH)
2023 NYS Games Session 1
Jun 26, 2023
Physical - Athlete
5' 8"
Ht
150.6
Wt
Grip Strgth (RH)
Grip Strgth (LH)