@JackDiefenderf1 
87.4
Velocity (max)
1/12/25
CLASS OF 2026
LHP
1B
Jack
Diefenderfer
Prattville Christian Academy (HS) • AL
6' 4" • 222.5LBS
L/L • 18yr
Travel Team: TPL
6' 4" • 222.5LBSL/L • 18yr
Travel Team: TPL
Rankings
2026 National
Rankings available to Premium Subscriber
2026 State
Rankings available to Premium Subscriber
Commitment
Best Of Stats
Fastball
84.5 - 86.4
Velo Range
1/12/25
2003
Spin Rate (avg)
1/12/25
Changeup
79 - 80
Velo Range
1/12/25
2080
Spin Rate (avg)
1/12/25
Curveball
68.4 - 70.4
Velo Range
6/17/25
2031
Spin Rate (avg)
6/17/25
Slider
71 - 72
Velo Range
1/12/25
1963
Spin Rate (avg)
1/12/25
Positional Tools
Hitting
Hitting
Pitching
2025
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Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
87.4
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).
1989
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.
23.7
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).
69.4
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).
2031
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).
79.1
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).
2080
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).
71.6
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).
1963
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).
Yellowhammer State Games (Invite-Only)
Jun 17, 2025
Trackman - Fastball
85.8
Velocity (max)
81.5 - 85.8
Velo Range
82.4
Eff Velocity (avg)
2,154
Spin Rate (max)
1,986
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
70.6
Velocity (max)
68.4 - 70.4
Velo Range
68.3
Eff Velocity (avg)
2,092
Spin Rate (max)
2,031
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
South Alabama Preseason All-State (Invite-Only)
Jan 12, 2025
Trackman - Fastball
87.4
Velocity (max)
84.5 - 86.4
Velo Range
82.9
Eff Velocity (avg)
2,065
Spin Rate (max)
2,003
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
71.9
Velocity (max)
71.0 - 71.9
Velo Range
70.1
Eff Velocity (avg)
2,013
Spin Rate (max)
1,963
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
79.8
Velocity (max)
78.6 - 79.6
Velo Range
77.8
Eff Velocity (avg)
2,114
Spin Rate (max)
2,080
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Pitch Scores
2025
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.
Pitching Velos
2025
2024
2023
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)
84.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
69.0
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
80.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
79.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
67.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
74.5
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
78.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
73.5
Game Performance
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Physical
2025
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: LHP/1B
Body: 6-4, 223-pounds. Physical XL frame, present strength.
Delivery: Repeatable delivery with gradual build of pace to delivery.
Arm Action: LH. Quick, two-piece arm action.
FB: T86, 82-86 mph. Tailing action with good ride and life when elevated. T2154, 1986 average rpm.
CB: 68-70 mph. Sweeping action with substantial horizontal shape. Feel to land to back foot vs. right-handers. T2092, 2031 average rpm.
CH: Fading action. Good arm speed and plays well off of FB.
Positional Profile: LHP/1B
Body: 6-4, 225-pounds. Physical build with a strong lower half.
Delivery: Moves well down the mound, good tempo.
Arm Action: LH. Shorter arm, hides the ball.
FB: T87, 84-86 mph. Arm side life, late movement. T2065, 2003 average rpm.
SL: 71-72 mph. Sweeping shape, plays down. T2013, 1963 average rpm.
CH: 79-80 mph. Occasional cut. Spotty feel. T2114, 2080 average rpm.