@jackstefani4 21
Hand Speed (max)
6/06/23
CLASS OF 2026
OF
RHP
Jack
Stefani
Glenbrook South (HS) • IL
6' 3" • 205LBS
S/R • 17yr 6mo
Travel Team: Top Tier North
6' 3" • 205LBSS/R • 17yr 6mo
Travel Team: Top Tier North
Rankings
2026 National
Rankings available to Premium Subscriber
2026 State
Rankings available to Premium Subscriber
Commitment
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Best Of Stats
74.8
Bat Speed (max)
8/06/24
17.4
Rot. Acc (max)
7/16/24
25
Hard Hit %
7/16/24
96.3
Exit Velocity (max)
8/06/24
85.3
Exit Velocity (avg)
7/16/24
344
Distance (max)
8/06/24
56
Sweet Spot %
7/16/24
7.31
60-yd
7/16/24
4.06
30-yd
8/06/24
1.70
10-yd
8/06/24
19.1
Run speed (max)
7/16/24
-
INF Velo
88
OF Velo
8/06/24
-
C Velo
-
Pop Time
Fastball
92
Velocity (max)
7/16/25
88 - 90
Velo Range
7/16/25
2395
Spin Rate (avg)
7/16/24
Changeup
66.4 - 70.2
Velo Range
7/16/24
1866
Spin Rate (avg)
7/16/24
Curveball
70 - 72
Velo Range
7/16/25
1985
Spin Rate (avg)
7/16/24
Slider
67 - 68
Velo Range
8/06/24
1742
Spin Rate (avg)
8/06/24
Positional Tools
2024
2023
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.31
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
88.0
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.
13.2
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.71
Outfield Velocity
The athlete's maximum throwing velocity from an outfield 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.
11.4
Hitting
2024
2023
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
96.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
84.4
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
344
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
210
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
23.3597
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).
87.9
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
79.7
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
330
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
198
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
23.2034
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.
Illinois State Games (Invite-Only)
Aug 6, 2024
Trackman - Hitting
96.3
Exit Velocity (max)
83.6
Exit Velocity (avg)
212
Distance (avg)
344
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Central Illinois Summer ID
Jul 16, 2024
Trackman - Hitting
92.0
Exit Velocity (max)
85.3
Exit Velocity (avg)
207
Distance (avg)
314
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Top Tier Scout Day
Jun 6, 2023
Trackman - Hitting
87.9
Exit Velocity (max)
79.7
Exit Velocity (avg)
198
Distance (avg)
330
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2024
2023
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
20.9
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
19.1
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
74.8
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
67.8
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.
21.0
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
18.0
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
71.4
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
66.0
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.
Illinois State Games (Invite-Only)
Aug 6, 2024
Blast - Hitting
20.9
Hand Speed (max)
19.2
Hand Speed (avg)
74.8
Bat Speed (max)
67.5
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Central Illinois Summer ID
Jul 16, 2024
Blast - Hitting
20.9
Hand Speed (max)
19.1
Hand Speed (avg)
72.3
Bat Speed (max)
68.3
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Top Tier Scout Day
Jun 6, 2023
Blast - Hitting
21.0
Hand Speed (max)
18.0
Hand Speed (avg)
71.4
Bat Speed (max)
66.0
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2024
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
87.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
83.6
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).
2277
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.
27.2
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).
65.6
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).
1934
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).
68.2
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).
1830
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).
66.4
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).
1718
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).
Illinois State Games (Invite-Only)
Aug 6, 2024
Trackman - Fastball
84.9
Velocity (max)
81.7 - 84.2
Velo Range
81.4
Eff Velocity (avg)
2,361
Spin Rate (max)
2,240
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
66.3
Velocity (max)
63.7 - 66.1
Velo Range
62.7
Eff Velocity (avg)
1,969
Spin Rate (max)
1,883
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
67.8
Velocity (max)
67.2 - 67.8
Velo Range
65.6
Eff Velocity (avg)
1,965
Spin Rate (max)
1,742
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
67.6
Velocity (max)
66.0
Eff Velocity (avg)
1,652
Spin Rate (max)
1,652
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Central Illinois Summer ID
Jul 16, 2024
Trackman - Fastball
87.1
Velocity (max)
84.2 - 86.7
Velo Range
82.6
Eff Velocity (avg)
2,456
Spin Rate (max)
2,395
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
67.5
Velocity (max)
65.0 - 67.4
Velo Range
2,145
Spin Rate (max)
1,985
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - Slider
68.3
Velocity (max)
63.3 - 67.8
Velo Range
61.7
Eff Velocity (avg)
1,893
Spin Rate (max)
1,699
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
70.8
Velocity (max)
66.4 - 70.2
Velo Range
66.0
Eff Velocity (avg)
2,093
Spin Rate (max)
1,866
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Pitch Scores
2024
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
Curveball
Hammer+
A hammer breaking ball drops vertically with velocity through the zone, or 12-to-6 movement. Hammer+ of 100 is MLB average.
Curveball
Sweep+
A sweeping breaking ball moves horizontally with velocity through the zone. Sweep+ 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.
Central Illinois Summer ID
Jul 16, 2024
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+
Pitch Scores - Slider
Hammer+
Sweep+
Pitching Velos
2025
2024
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
92.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
89.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
71.0
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
87.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
84.2
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
65.5
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
66.5
Game Performance
2024
2023
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.70
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.06
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
7.31
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
RSi
The reactive strength index measurement of an athlete's explosiveness by comparing their jump height to the ground contact time in between their jumps. On a scale of 0-5.
Vertical Jump
A measure of any athlete's body strength and reach calculated from the flight time divided by the contact time.
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.92
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.33
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
7.71
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
Central Illinois Summer ID
Jul 16, 2024
Swift
1.76
10-yd
4.09
30-yd
7.31
60-yd
19.1
Run speed (max)
1.65
RSI (max)
27.8
Jump Height (max)
Vizual Edge
2024
Edge Score
The highest Edge Score within the given year. Edge Score is a comprehensive score that takes the core-six visual skills into account, providing an assessment of an athlete’s overall visual ability.
70.03
Pitch Ai
Notes
News
- Class of 2026 Rankings Update - Aug 27, 2025
- Illinois Class of 2026 Rankings Update - Dec 4, 2024
- Prep Baseball Illinois Best of 2024: Average Changeup Horizontal Movement - Dec 3, 2024
- Prep Baseball Illinois Best of 2024: Top Average Fastball Spin Rate - Nov 28, 2024
- Illinois State Games: Class of 2026 Right-Handed Pitcher Analysis - Nov 7, 2024
- Illinois State Games: Class of 2026/2027 Outfield Analysis - Oct 31, 2024
- Central Illinois Summer ID: Pitcher Analysis - Sep 10, 2024
- Central Illinois Summer ID: Position Player Analysis - Sep 10, 2024
- Central Illinois Summer ID: Quick Hits - Jul 19, 2024
- Top Tier North: Takeaways - Aug 23, 2023
Comments
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Physical
2024
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.
Positional Profile: OF/RHP
Body: 6-1, 184.3-pounds.
Delivery: Controlled tempo and mover, medium leg-lift with a slight coil into his back hip, tall/fall down the mound, stays in-line.
Arm Action: RH. Loose arm action, high 3/4 release.
FB: T85, 82-84 mph. Plays with life and run to his arm-side. T2361, 2240 average rpm.
CB: 64-66 mph. 11/5 shape with depth. T1969, 1883 average rpm.
SL: 67-68 mph. Shorter action than the CB, more lateral break. T1965, 1742 average rpm.
CH: 68-68 mph. Mostly straight action. T1652, 1652 average rpm.
Positional Profile: OF/RHP
Body: 6-1, 184.3-pounds.
Hit: SH. LH: Tall, narrow setup, open stance, high leg lift back to even. RH: Tall, narrow stance, slightly open, small leg lift, long stride. LH: Athletic hands, uphill bat path, looks to elevate the baseball, pull-side approach. RH: Flat path, intentful, looks to elevate, pull-side approach. 67.5 mph bat speed with 13 G’s of rotational acceleration.
Power: 96 max exit velocity, averaged 83.6 mph. 344’ max distance.
Arm: RH. OF - 88 mph. Full arm action, clean, 3/4 slot.
Defense: Athletic mover, fields ball out front, attacks with confidence, shuffle steps on throws.
Run: 7.41 runner in the 60.
OF/RHP Jack Stefani (Glenbrook South, 2026) is an intriguing prospect in the state’s 2026 class. He’s a switch-hitter at the plate with twitchy actions, producing a max exit velocity of 92 mph, but staying on the barrel for an average of 85.3 mph. From the outfield he showed clean, athletic actions with a long and loose arm, producing an 88 mph bullet on his best ball to home. On the mound, he showed athletic actions, producing a mid-80s fastball that was up to 87.1 mph with quality spin (avg. 2395) and an average of 20.1 inches of horizontal movement. An upside prospect at 6-foot-2, 185-pounds.
Positional Profile: OF/RHP
Body: 6-2, 185-pounds. Athletic frame with projection.
Hit: SH. Athletic, tall setup, calm approach, high leg lift into medium stride. RH: Loose, level path, line drive approach, creates some loft on the ball. LH: Level path, strong hands, swings with intent, line drive approach, creates some natural loft on the ball. 68.3 mph bat speed with 15 G’s of rotational acceleration.
Power: 92 max exit velocity, averaged 85.3 mph. 314’ max distance.
Arm: RH. OF - 88 mph. Long, loose, quick arm action, high 3/4 slot; throws carry.
Defense: Confident one hand gather out front, intentful crow hop to target.
Run: 7.31 runner in the 60.
Positional Profile: OF/RHP
Body: 6-2, 185-pounds. Athletic frame with projection.
Delivery: Simple, high leg lift with tuck, drop/drive down the mound.
Arm Action: RH. Long, quick arm, 3/4 slot.
FB: T87, 84-87 mph. Firm out of the hand with slight run. T2456, 2395 average rpm.
CB: 65-67 mph. 12/6 shape, plays low. T2145, 1985 average rpm.
SL: 63-68 mph. 10/4 shape. T1893, 1699 average rpm.
CH: 66-70 mph. Heavy fade, developing feel. T2093, 1866 average rpm.
OF Jack Stefani (Glenbrook South, 2026) is a 6-foot, 170-pound, athletically-built, switch-hitter to follow in the class. Stefani showed true switch-hit ability with a fluid stroke from both sides, particularly the left, where he flashed loose, quick hands, stayed on-plane with natural lift and drove balls to both gaps. Posted a max exit velocity of 88 mph during BP and his furthest batted ball traveled 330’. Defensively, he flashed steady hands and a quick arm that topped at 82 mph from the outfield.