81
Velocity (max)
3/15/26
CLASS OF 2027
RHP
Jonathan
Kratz
Sun Prairie (HS) • WI
6' 4" • 218LBS
R/R • 17yr 3mo
Travel Team: Silver Sluggers Navy
6' 4" • 218LBSR/R • 17yr 3mo
Travel Team: Silver Sluggers Navy
Rankings
2027 National
Rankings available to Premium Subscriber
2027 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
Fastball
79 - 81
Velo Range
10/05/25
2252
Spin Rate (avg)
3/15/26
Changeup
71.8 - 74.2
Velo Range
6/26/25
2054
Spin Rate (avg)
6/26/25
Curveball
63.4 - 66.5
Velo Range
3/15/26
2127
Spin Rate (avg)
6/26/25
Slider
69.9 - 71.1
Velo Range
10/05/25
2094
Spin Rate (avg)
10/05/25
Positional Tools
Hitting
Hitting
Pitching
2026
2025
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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).
80.3
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).
2252
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.
28.1
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).
64.8
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).
1881
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).
68.0
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).
1955
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).
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
80.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
78.4
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).
2176
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.
27.8
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).
65.3
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).
2048
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).
72.9
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).
2054
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).
70.4
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).
2094
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).
Madison Preseason ID
Mar 15, 2026
Trackman - Fastball
81.0
Velocity (max)
79.8 - 80.8
Velo Range
79.1
Eff Velocity (avg)
2,305
Spin Rate (max)
2,252
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
67.0
Velocity (max)
63.4 - 66.5
Velo Range
63.9
Eff Velocity (avg)
2,041
Spin Rate (max)
1,881
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
69.3
Velocity (max)
67.0 - 69.1
Velo Range
66.5
Eff Velocity (avg)
2,078
Spin Rate (max)
1,955
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Southern Wisconsin Fall ID
Oct 5, 2025
Trackman - Fastball
80.6
Velocity (max)
79.3 - 80.5
Velo Range
78.4
Eff Velocity (avg)
2,285
Spin Rate (max)
2,183
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
66.7
Velocity (max)
64.3 - 66.2
Velo Range
63.1
Eff Velocity (avg)
2,054
Spin Rate (max)
1,969
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
71.6
Velocity (max)
69.9 - 71.1
Velo Range
68.1
Eff Velocity (avg)
2,193
Spin Rate (max)
2,094
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Verona Summer ID
Jun 26, 2025
Trackman - Fastball
78.7
Velocity (max)
75.9 - 78.4
Velo Range
75.1
Eff Velocity (avg)
2,256
Spin Rate (max)
2,171
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
65.9
Velocity (max)
65.0 - 65.9
Velo Range
62.6
Eff Velocity (avg)
2,227
Spin Rate (max)
2,127
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
74.8
Velocity (max)
71.8 - 74.2
Velo Range
70.5
Eff Velocity (avg)
2,107
Spin Rate (max)
2,054
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
2026
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.
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.
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.
Madison Preseason ID
Mar 15, 2026
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+
Pitch Scores - Slider
Hammer+
Sweep+
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)
80.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
64.5
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.0
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)
78.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
65.2
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
73.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
70.5
Game Performance
2025
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.
Vizual Edge
2025
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.
62.54
Pitch Ai
Notes
News
- Southern Wisconsin Fall ID: Player Analysis - Oct 17, 2025
- Southern Wisconsin Fall ID: Quick Hits - Oct 9, 2025
- Southern Wisconsin Fall ID: Pitching Data Dive - Oct 8, 2025
- Southern Wisconsin Fall ID: Statistical Analysis - Oct 6, 2025
- Verona Summer ID: Player Analysis - Aug 25, 2025
- Verona Summer ID: Pitcher Data Dive - Jul 3, 2025
- Verona Summer ID: Statistical Analysis - Jul 2, 2025
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.
Jonathan Kratz, Sun Prairie (WI), 2027
Positional Profile: RHP
Body: 6-4, 219-pounds. Athletic build with more strength coming.
Delivery: Stretch only, high knee lift, tall and fall, shorter stride, stays tall.
Arm Action: RH. Full circle, high 3/4 slot.
FB: T81, 79-81 mph. Plays with some arm side run, around the zone. T2285, 2183 average rpm.
CB: 64-66 mph. Sharp 12/6 breaker, works low in the zone, can throw over the plate. T2054, 1969 average rpm.
SL: 70-71 mph. Similar to curveball, harder, more horizontal movement. T2193, 2094 average rpm.
ATH: 15.70 max vertical.
+ RHP Jonathan Kratz (Sun Prairie, 2027) is a long levered and projectable right-hander who put himself on the map with his performance on the mound on Sunday. Kratz pitched exclusively out of the strength and delivered his arsenal from a high 3/4 arm slot. He levered the ball down hill and was up to 81 mph with his fastball. He deployed a sharp 12/6 curveball that displayed some out pitch characteristics. He rounded out his arsenal with a slider that provided more lateral break than the curve which should play well against same-handed hitters in game.
Positional Profile: RHP/3B
Body: 6-5, 215 pounds. XL frame, physical.
Delivery: High leg kick, short downhill, lands closed.
Arm Action: RH. Full arm path, repeatable, 3/4 slot.
FB: T79, 76-78 mph; Arm-side run. T2256, 2171 average rpm.
CB: 65-66 mph; 11/5, sharp and short. T2227, 2127 average rpm.
CH: 72-74 mph; Maintains arm slot and speed. T2107, 2054 average rpm