87.8
Exit Velocity (max)
4/19/25
CLASS OF 2029
OF
LHP
JJ
Herzog
NA (HS) • TX
5' 7" • 151LBS
L/L • 14yr 9mo
5' 7" • 151LBSL/L • 14yr 9mo
Commitment
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Best Of Stats
78.4
Exit Velocity (avg)
4/19/25
287
Distance (max)
4/19/25
50
Sweet Spot %
4/19/25
7.60
60-yd
4/19/25
4.27
30-yd
4/19/25
1.87
10-yd
4/19/25
18.4
Run speed (max)
4/19/25
71
INF Velo
4/19/25
75
OF Velo
4/19/25
-
C Velo
-
Pop Time
Fastball
75
Velocity (max)
7/02/25
70.3 - 74
Velo Range
7/02/25
1966
Spin Rate (avg)
7/02/25
Curveball
57 - 59
Velo Range
7/02/25
1861
Spin Rate (avg)
7/02/25
Slider
62 - 63
Velo Range
7/02/25
1640
Spin Rate (avg)
7/02/25
Positional Tools
2025
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.60
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
71.0
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
75.0
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.
11.6
Hitting
2025
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
87.8
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
78.4
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
287
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
199
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
23.9612
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.
2025 TX Rising Stars Games (Invite-Only)
Apr 19, 2025
Trackman - Hitting
87.8
Exit Velocity (max)
78.4
Exit Velocity (avg)
199
Distance (avg)
287
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
Pitching
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
74.8
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
72.2
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).
1966
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).
57.7
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).
1861
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).
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
62.0
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).
1640
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).
North Austin Summer ID
Jul 2, 2025
Trackman - Fastball
74.8
Velocity (max)
70.3 - 74.0
Velo Range
71.6
Eff Velocity (avg)
2,074
Spin Rate (max)
1,966
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
59.5
Velocity (max)
56.6 - 58.7
Velo Range
56.4
Eff Velocity (avg)
1,944
Spin Rate (max)
1,861
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
62.8
Velocity (max)
61.5 - 62.5
Velo Range
60.5
Eff Velocity (avg)
1,733
Spin Rate (max)
1,640
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Pitch Scores
Pitching Velos
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
75.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
72.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
58.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
62.5
Game Performance
2025
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.87
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.26
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
7.6
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
Vizual Edge
Pitch Ai
Notes
Comments
Draft Reports
Contact
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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: OF/LHP LHP will get stronger. Moves well on mound. Repeats delivery, can firm getting over front side. Cutoff circle creates some deception, looking for arm speed to increase with added strength and physical maturity. FB will develop more velocity, will firm ability to work around zone as timing to delivery and arm action firms. CB and SL developing, looking for release point to firm. CB/SL show different shapes, will be effective when command firms. Nice upside to young LHP.
Body: 5-7, 151-pounds. Projects well physically. Width to shoulders and back projects well for added strength.
Delivery: Stretch only, knee lift with inward turn of hip and shoulder. Slight push out of foot, works down the slope. Upright, work to get over front side more with chest. Spinoff finish.
Arm Action: LH. Cutoff circle. Fair extension to release, solid finish. Arm speed will develop. Late at times with front shoulder running away from arm, stay on time with delivery.
FB: T75, 70-74 mph. Arm side tail present. T2074, 1966 average rpm.
CB: 57-59 mph. Shows nice spin developing. Gets on side, work to stay on top. Depth present when landed. T1944, 1861 average rpm.
SL: 62-63 mph. Shows developing feel for pitch. Nice down finish at times. Release point can be firmed. T1733, 1640 average rpm.
Positional Profile: OF/LHP LHH/OF/INF…solid bat/power combo in future. Solid defensive player, moves well on baseball field. Solid bat/power combo in future with adjustments, will take patience. Does have solid base to work from.
Body: 5-7, 152-pounds. Width to shoulders and back. Will have strength to body in future.
Hit: LHH. Upright stance, lands in good position to hit. Rotational back foot, lower 1/2 works fine in swing. Barrel/hands start in good position to hit. With start of swing, gets lead arm bar with separation at stride, dumps barrel around creating length to swing. Lead elbow flares up with swing. Work to soften elbow with stride, eliminating lead arm bar. Take direct path to zone with barrel. Lead arm/elbow can be up, don't let it flare up with swing. Adjustments will take time.
Power: 88 max exit velocity, averaged 78.4 mph. 287' max distance. Project solid bat/power combo in future with adjustments. Will take time to make adjustments, will be solid in time.
Arm: LH. INF-71 mph. OF-75 mph. OF…cutoff circle with length to backside, low slot. Would like to see development of full circle arc circle. Work to keep elbow up throwing and staying behind baseball with hand for carry to throws. 1B…arm works well with solid throws.
Defense: OF…Moves well to baseball, nice job of breaking down to field. feet. Hands set in good position, would like to see bit more out in front. 1B…Moves well to baseball, hands work fielding. Solid base to develop from, will solid infielder in future.
ATH: 7.60 runner in the 60. 1.87 and 4.26 in the 10 and 30 yard splits. Good start, good stride length. Upright runner with shoulders and head up for last 40 yards approx. Work to get lean forward with shoulders and head.