Prep Baseball Report

CLASS OF 2025

LHP
LHP

Karson
Stiefer

Prairie Ridge (HS) • IL
6' 1" • 168LBS
L/L • 17yr 4mo
Travel Team: GRB Rays
2025 National

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

Best Of Stats

Pitching

Fastball

82.4
Velocity (max)
2/10/24
80 - 82
Velo Range
2/10/24
1920
Spin Rate (avg)
2/10/24

Changeup

72.1 - 73.3
Velo Range
2/10/24
1508
Spin Rate (avg)
2/10/24

Curveball

70 - 72
Velo Range
2/10/24
1794
Spin Rate (avg)
2/10/24

Slider

71 - 72
Velo Range
2/10/24
1796
Spin Rate (avg)
2/10/24
Power
92.6
Exit Velocity (max)
2/11/23
87.9
Exit Velocity (avg)
2/10/24
348
Distance (max)
2/10/24
67
Sweet Spot %
2/11/23
Hitting
24.3
Hand Speed (max)
2/11/23
75.1
Bat Speed (max)
2/11/23
20.2
Rot. Acc (max)
2/11/23
50
Hard Hit %
2/10/24
Run
7.47
60
7/07/21
3.86
30-yd
2/10/24
1.67
10-yd
2/11/23
18.8
Run speed (max)
2/10/24
Defense
74
INF Velo
2/11/23
-
OF Velo
-
C Velo
-
Pop Time

Positional Tools

2024
2023
2021
Infield Velocity
69.0
Home to First
3.87
Infield Velocity
74.0
60 Yard Dash
7.47
Home to First
4.51
Infield Velocity
74.0
Power / Speed Score
11.1
McHenry Preseason ID
Feb 10, 2024
Position
69
INF Velo
92
Exit Velo
McHenry Preseason ID
Feb 11, 2023
Position
74
INF Velo
3.87
H-1st
93
Exit Velo
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Position
7.47
60-yard
74
INF Velo
83
Exit Velo
Power Speed Score
Future Prospects Showcase & Educational Camp
Jan 31, 2021
Position
65
INF Velo
75
Exit Velo
4.51
H-1st

Hitting

2024
2023
2021
Exit Velocity Max
92.1
Exit Velocity Avg
87.9
Distance Max
348
Distance Avg
84
Launch Angle Avg
1.5
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Exit Velocity Max
92.6
Exit Velocity Avg
87.5
Distance Max
338
Distance Avg
206
Launch Angle Avg
16.0
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Exit Velocity Max
83.0
Exit Velocity Avg
71.4
Distance Max
269
Distance Avg
162
Launch Angle Avg
19.7
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
McHenry Preseason ID
Feb 10, 2024
Trackman - Hitting
92.1
Exit Velocity (max)
87.9
Exit Velocity (avg)
84
Distance (avg)
348
Distance (max)
Hard Hit %
Sweet Spot %
Fly Ball %
Ground Ball %
McHenry Preseason ID
Feb 11, 2023
Trackman - Hitting
92.6
Exit Velocity (max)
87.5
Exit Velocity (avg)
206
Distance (avg)
338
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Trackman - Hitting
83.0
Exit Velocity (max)
71.4
Exit Velocity (avg)
162
Distance (avg)
269
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %

Hitting

2024
2023
2021
Hand Speed Max
21.6
Hand Speed Avg
21.2
Bat Speed Max
69.7
Bat Speed Avg
67.6
Rotational Acceleration Max
Rotational Acceleration Avg
On-Plane Efficiency Max
On-Plane Efficiency Avg
Hand Speed Max
24.3
Hand Speed Avg
22.9
Bat Speed Max
75.1
Bat Speed Avg
67.7
Rotational Acceleration Max
Rotational Acceleration Avg
On-Plane Efficiency Max
On-Plane Efficiency Avg
Hand Speed Max
21.0
Hand Speed Avg
19.7
Bat Speed Max
66.7
Bat Speed Avg
63.0
Rotational Acceleration Max
Rotational Acceleration Avg
On-Plane Efficiency Max
On-Plane Efficiency Avg
McHenry Preseason ID
Feb 10, 2024
Blast - Hitting
21.6
Hand Speed (max)
21.2
Hand Speed (avg)
69.7
Bat Speed (max)
67.6
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
McHenry Preseason ID
Feb 11, 2023
Blast - Hitting
24.3
Hand Speed (max)
22.9
Hand Speed (avg)
75.1
Bat Speed (max)
67.7
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Blast - Hitting
21.0
Hand Speed (max)
19.7
Hand Speed (avg)
66.7
Bat Speed (max)
63.0
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency

Pitching

2024
2023
2021
Fastball
Velocity Max
82.4
Fastball
Velocity Avg
81.0
Fastball
Spin Rate Avg
1920
Fastball
Spin Score Avg
23.7
Fastball
Total Movement Avg
Curveball
Velocity Avg
70.8
Curveball
Spin Rate Avg
1794
Curveball
Total Movement Avg
Changeup
Velocity Avg
72.7
Changeup
Spin Rate Avg
1508
Changeup
Total Movement Avg
Slider
Velocity Avg
71.4
Slider
Spin Rate Avg
1796
Slider
Total Movement Avg
Fastball
Velocity Max
80.6
Fastball
Velocity Avg
79.1
Fastball
Spin Rate Avg
1755
Fastball
Spin Score Avg
22.2
Fastball
Total Movement Avg
Curveball
Velocity Avg
68.5
Curveball
Spin Rate Avg
1659
Curveball
Total Movement Avg
Changeup
Velocity Avg
69.7
Changeup
Spin Rate Avg
1471
Changeup
Total Movement Avg
Fastball
Velocity Max
74.2
Fastball
Velocity Avg
73.8
Fastball
Spin Rate Avg
1474
Fastball
Spin Score Avg
20.0
Fastball
Total Movement Avg
Curveball
Velocity Avg
58.1
Curveball
Spin Rate Avg
1309
Curveball
Total Movement Avg
Changeup
Velocity Avg
60.6
Changeup
Spin Rate Avg
1135
Changeup
Total Movement Avg
McHenry Preseason ID
Feb 10, 2024
Trackman - Fastball
82.4
Velocity (max)
80.2 - 81.9
Velo Range
79.8
Eff Velocity (avg)
2,029
Spin Rate (max)
1,920
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
72.1
Velocity (max)
70.1 - 71.6
Velo Range
69.2
Eff Velocity (avg)
1,864
Spin Rate (max)
1,794
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
72.0
Velocity (max)
71.1 - 71.8
Velo Range
69.6
Eff Velocity (avg)
1,882
Spin Rate (max)
1,796
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)
72.1 - 73.3
Velo Range
72.2
Eff Velocity (avg)
1,643
Spin Rate (max)
1,508
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
McHenry Preseason ID
Feb 11, 2023
Trackman - Fastball
80.6
Velocity (max)
78.1 - 80.1
Velo Range
77.8
Eff Velocity (avg)
1,830
Spin Rate (max)
1,755
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
68.7
Velocity (max)
68.2 - 68.7
Velo Range
66.4
Eff Velocity (avg)
1,796
Spin Rate (max)
1,659
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
71.2
Velocity (max)
68.8 - 70.7
Velo Range
69.1
Eff Velocity (avg)
1,586
Spin Rate (max)
1,471
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Trackman - Fastball
74.2
Velocity (max)
73.5 - 74.2
Velo Range
71.9
Eff Velocity (avg)
1,633
Spin Rate (max)
1,474
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
58.8
Velocity (max)
57.4 - 58.8
Velo Range
55.4
Eff Velocity (avg)
1,412
Spin Rate (max)
1,309
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
60.6
Velocity (max)
59.7
Eff Velocity (avg)
1,135
Spin Rate (max)
1,135
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)

Pitch Scores

2024
2021
Fastball
Hop+
Fastball
Sink+
Fastball
Rise+
Curveball
Hammer+
Curveball
Sweep+
Slider
Hammer+
Slider
Sweep+
Fastball
Hop+
Fastball
Sink+
Fastball
Rise+
Curveball
Hammer+
Curveball
Sweep+
McHenry Preseason ID
Feb 10, 2024
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+
Pitch Scores - Slider
Hammer+
Sweep+
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+

Pitching Velos

2024
2023
2021
Fastball
Velocity Max
82.0
Fastball
Velocity Avg
79.5
Changeup
Velocity Avg
71.5
Slider
Velocity Avg
70.0
Fastball
Velocity Max
81.0
Fastball
Velocity Avg
79.0
Curveball
Velocity Avg
68.5
Changeup
Velocity Avg
70.0
Fastball
Velocity Max
74.0
Fastball
Velocity Avg
70.8
Curveball
Velocity Avg
57.8
Changeup
Velocity Avg
59.5
Rock Summer Championship 17U
Jul 18, 2024
Pitching
79
Max FB
77 - 79
FB
69 - 72
CH
67 - 70
SL
McHenry Preseason ID
Feb 10, 2024
Pitching
82
Max FB
80 - 82
FB
70 - 72
CB
72 - 73
CH
71 - 72
SL
McHenry Preseason ID
Feb 11, 2023
Pitching
81
Max FB
78 - 80
FB
68 - 69
CB
69 - 71
CH
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
Pitching
74
Max FB
73 - 74
FB
57 - 59
CB
60 - 61
CH
Future Prospects Showcase & Educational Camp
Jan 31, 2021
Pitching
69
Max FB
68 - 68
FB
57 - 58
CB
56 - 61
CH

Game Performance

2024
2023
10 Yard Dash
1.69
30 Yard Dash
3.86
Top Speed (MPH)
RSi
Vertical Jump
10 Yard Dash
1.67
30 Yard Dash
3.87
Top Speed (MPH)
RSi
Vertical Jump
McHenry Preseason ID
Feb 10, 2024
Swift
1.69
10-yd
3.86
30-yd
18.8
Run speed (max)
1.76
RSi (max)
30.1
Jump Height (max)
McHenry Preseason ID
Feb 11, 2023
Swift
1.67
10-yd
3.87
30-yd
18.7
Run speed (max)
1.39
RSi (max)
1.39
RSi (avg)
1,534
Jump Power (max)
28.9
Jump Height (max)
28.0
Jump Height (avg)

Visual Edge

2024
2023
2021
Edge Score
80.46
Edge Score
78.78
Edge Score
61.84

Pitch Ai

2021
Arm Speed
Knee Extension Velo
Deception
Hip-Shoulder Separation
2025 Future Prospect Games (Invite Only)
Jul 7, 2021
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)
Lateral Trunk Tilt (avg)
Arm Path (avg)
Deception (avg)
Torque (avg)
Efficiency (avg)
Sequencing (avg)

Notes

Comments

8/04/24
Verbally committed to Wisconsin-Parkside.
2/10/24

Positional Profile: LHP
Body: 6-1, 168-pounds. Lean, projectable frame with room to fill out.
Delivery: Medium leg lift with coil into balanced point, drop/drive delivery down the mound.
Arm Action: LH. Long arm in the back, high 3/4 arm slot.
FB: T82, 80-82 mph. Has life out of the hand, locates to the arm side. Heavy arm-side run. T2029, 1920 average rpm.
CB: 70-72 mph. Gradual 1/7 shape, flashes depth. Plays at the bottom of the zone. T1864, 1794 average rpm.
SL: 71-72 mph. Flashes sharp 2/8 shape at times. Developing. T1882, 1796 average rpm.
CH: 72-73 mph. Arm-side fade with depth. Has advanced feel for the pitch and the zone. T1643, 1508 average rpm.

2/10/24

Positional Profile: LHP
Hit: LHH. Tall, open setup, small leg lift, medium stride. Quick hands, flat path with some whip through the zone, looks to keep the ball on a line. 67.6 mph bat speed with 11 G’s of rotational acceleration.
Power: 92 max exit velocity, averaged 87.9 mph. 348’ max distance.
Arm: LH. INF - 69 mph. Loose arm action with some whip. Accurate, low 3/4 arm slot.
Defense: Athletic actions, fluid footwork, soft hands, moves well around the bag with some feel.
Run: 3.86 30-yard dash.

2/15/23

1B/LHP Karson Stiefer (Prairie Ridge) - is an athletic, left/left, two-way prospect. Stiefer, listed at 6-foot, 163-pounds, ran a 3.87 30-yard split, second best of the event. At the plate he stays short and quick to the baseball looking to control the barrel and spray hard line-drive contact to all fields. Defensively, he is an asset at first base with an understanding and feel for the position. On the mound, he filled up the strike zone with a polished three-pitch mix and fastball that topped at 80 mph.

2/11/23

Positional Profile: 1B/LHP
Body: 6-0, 163-pounds. Wiry frame with room for continued physical development.
Hit: LHH. Narrow, open setup, long stride. Quick, direct hands, on the barrel, uphill path and worked the middle of the field.
Power: 93 max exit velocity, averaged 87.5 mph.
Arm: LH. INF - 74 mph. Loose, whippy arm, 3/4 release.
Defense: Athletic actions, active footwork, steady hands, two-hand gather, secures the ball into his body,
Run: 3.87 runner in the 30-yard dash. 

Delivery: Clean operation, medium leg-lift into balance point, drop/drive lower-half, stride works in-line.
Arm Action: LH. Long out of the glove into a 3/4 slot.
FB: T81, 78-80 mph. Plays with sink to the arm-side.  T1830, 1755 average rpm.
CB: 68-69 mph. Flashed sharp 1/7 shape.  T1796, 1659 average rpm.
CH: 69-71 mph. Clean out of the hand, fades to the arm-side.  T1586, 1471 average rpm.

 

4/16/22

Uncommitted. Wiry, 6-foot, 155-pound frame, long limbs with room for added growth. Made his varsity debut ad only a freshman and impressed over his four innings of work. The southpaw’s arm works long out of the glove into a ¾ slot, playing loose to release. Down the mound, he works with a slight drop/drive lower-half, moving quickly from balance point into a stride that works in-line to the plate, front foot landing square. His fastball sat mostly 75-77 mph with consistent life to the arm-side, setting up his off-speeds effectively. His go-to secondary offering was a heavy fading changeup, thrown confidently and often with feel for the zone, 66-69 mph. He also went to a 65-66 mph curveball, playing off a gradual 1/7 plane. 

7/07/21

Positional Profile: LHP/1B
Body: 5-10, 147-pounds.
Delivery: Tall and fall delivery, stays tall at release creating a downward angle on the hitter.
Arm Action: LH. Long, high 3/4 slot.
FB: T74, 73-74 mph. Occasional arm-side movement. T1632, 1473 average rpm.
CB: 57-59 mph. Gradual 1/7 shape. T1412, 1309 average rpm.
CH: 60-61 mph. Flashed arm-side fade.

Hit: LHH. Open setup, knee-knocks into a long stride.  Loose/level path to the ball with a line-drive approach.
Power: 83.04 max exit velocity, averaged 71.35 mph. 269’ max distance.
Arm: LH. INF - 74 mph. High 3/4 slot.
Defense: Soft hands with a clean transfer, fluid footwork around the bag.
Run: 7.47 runner in the 60. 

1/31/21

Positional Profile: LHP
Body: 5-foot-9, 137-pounds.
Defense: Steady hands, works through the ball, smooth feet at times, advanced 1B actions for his age.
Arm: LH. INF - 65 mph. Short action, high 3/4 arm slot.
Hit: LHH. Open setup, rear leg load, front foot starts on toes, toe-tap trigger. Loose, fluid swing, repeatable actions, short/uphill path, consistent line drives.
Power: 75 mph exit velocity from the tee.
Run: 4.51 home-to-first. 

Delivery: Tall and fall delivery, smooth rhythm, leg kick works across body, lands square to target.
Arm Action: LH. Long action, over-the-top arm slot.
FB: T69, 68-68 mph. Mostly straight, intent to play at the top of the zone.
CB: 57-58 mph. 1/7 shape, tight at times, flashed strikes.
CH: 56-61 mph. Straight change, arm speed same as fastball.

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