81
Velocity (max)
10/03/25
CLASS OF 2029
LHP
1B
John
Hlavacek
Wake Forest (HS) • NC
6' 4" • 188LBS
L/L • 15yr 6mo
Travel Team: ZT Prospects
6' 4" • 188LBSL/L • 15yr 6mo
Travel Team: ZT Prospects
Rankings
2029 National
Rankings available to Premium Subscriber
2029 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
Fastball
79 - 81
Velo Range
2/07/26
1939
Spin Rate (avg)
2/07/26
Changeup
68 - 70
Velo Range
2/07/26
1648
Spin Rate (avg)
2/07/26
Curveball
70 - 71
Velo Range
10/03/25
2091
Spin Rate (avg)
2/07/26
88.3
Exit Velocity (max)
5/17/25
80.6
Exit Velocity (avg)
5/17/25
329
Distance (max)
5/17/25
62
Sweet Spot %
2/07/26
19.4
Hand Speed (max)
2/07/26
66.3
Bat Speed (max)
2/07/26
13.4
Rot. Acc (max)
2/07/26
-
Hard Hit %
8.01
60-yd
5/17/25
4.24
30-yd
2/07/26
1.90
10-yd
5/17/25
-
Run speed (max)
72
INF Velo
2/07/26
-
OF Velo
-
C Velo
-
Pop Time
Positional Tools
2026
2025
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Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
72.0
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
70.0
Hitting
2026
2025
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
86.5
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
77.3
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
326
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
239
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
25.0203
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).
88.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
80.6
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
329
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
112
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
2.773
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.
Preseason All-State: East (Invite-Only)
Feb 7, 2026
Trackman - Hitting
86.5
Exit Velocity (max)
77.3
Exit Velocity (avg)
239
Distance (avg)
326
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2025 Prep Baseball Scout Day: ZT Prospects
May 17, 2025
Trackman - Hitting
88.3
Exit Velocity (max)
80.6
Exit Velocity (avg)
112
Distance (avg)
329
Distance (max)
Sweet Spot %
Fly Ball %
Ground Ball %
Hitting
2026
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
19.4
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
18.5
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
66.3
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
64.8
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.
Preseason All-State: East (Invite-Only)
Feb 7, 2026
Blast - Hitting
19.4
Hand Speed (max)
18.5
Hand Speed (avg)
66.3
Bat Speed (max)
64.8
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2026
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
81.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
80.0
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).
1939
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.
24.2
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).
69.1
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).
2091
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).
69.1
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).
1648
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).
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
77.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
76.0
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).
1883
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.
24.8
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).
66.4
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).
2053
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).
67.6
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).
1310
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).
Preseason All-State: East (Invite-Only)
Feb 7, 2026
Trackman - Fastball
81.0
Velocity (max)
79.2 - 80.8
Velo Range
79.4
Eff Velocity (avg)
2,018
Spin Rate (max)
1,939
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - Curveball
70.5
Velocity (max)
68.0 - 70.2
Velo Range
66.9
Eff Velocity (avg)
2,168
Spin Rate (max)
2,091
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
70.0
Velocity (max)
68.5 - 69.9
Velo Range
67.5
Eff Velocity (avg)
1,798
Spin Rate (max)
1,648
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
2025 Prep Baseball Scout Day: ZT Prospects
May 17, 2025
Trackman - Fastball
77.1
Velocity (max)
75.3 - 76.8
Velo Range
73.7
Eff Velocity (avg)
1,974
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 - Curveball
67.4
Velocity (max)
65.3 - 67.4
Velo Range
63.9
Eff Velocity (avg)
2,126
Spin Rate (max)
2,053
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
68.1
Velocity (max)
67.0 - 68.1
Velo Range
65.0
Eff Velocity (avg)
1,339
Spin Rate (max)
1,310
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
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
2026
2025
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
81.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
80.0
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
Changeup
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).
81.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
76.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.5
Game Performance
2026
2025
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.24
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.
1.9
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
8.01
Vizual Edge
Pitch Ai
Notes
News
- Stat Analysis: Preseason All-State East - Feb 12, 2026
- Quick Hitters: Preseason All-State East Arms - Feb 11, 2026
- Preseason All-State East: Quick Hitters - Position Players - Feb 9, 2026
- Preview: 2026 Preseason All-State East - Feb 5, 2026
- Best of 2025: Fastball Movement Metrics - Jan 21, 2026
- Inside the 2029 Rankings: 50 Names to Know - Dec 1, 2025
- Summer Rewind: NC's Best Arms on TrackMan - Sep 9, 2025
- Data Dive: ZT Prospects Carolina Scout Day - May 21, 2025
Comments
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Physical
2026
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, 188-pounds. Physicall impressive
Delivery: Slow deliberate wind up. Rocker step that builds into a medium leg lift. Loose body and arm swing that works effortlessly.
Arm Action: LH. Builds up to a high 3/4 arm slot with back leg whip over. Arm speed is there and athleticism is present considering his age and size.
FB: T81, 79-81 mph. Struggle to command pitch, but still very raw. Comes out the hand well with good depth T2018, 1939 average rpm.
CB: 68-70 mph. T2168, 2091 average rpm.
CH: 68-70 mph. T1798, 1648 average rpm.
ATH: 4.24 in the30 yard split. 19.20 max vertical.
Positional Profile: LHP/1B
Body: 6-4, 188-pounds. Physicall impressive
Hit: LHH. LHH Spread out base with heavy barrel tilt. Minimal movement, just a small movement to generate torque. Rotational swinger. Path is direct with strength 64.8 mph bat speed with 11 G's of rotational acceleration.
Power: 87 max exit velocity, averaged 77.3 mph. 326' max distance.
Arm: LH. INF-72 mph. OTT compact swing
ATH: 4.24 in the30 yard split. 19.20 max vertical.