@wonny_49 
89.9
Velocity (max)
2/06/21
CLASS OF 2021
RHP
Stephen
Kwak
Bellarmine College Prep (HS) • CA
6' 3" • 205LBS
R/R • 22yr 11mo
Travel Team: California Bulldogs
Rankings
2021 National
Rankings available to Premium Subscriber
2021 State
Rankings available to Premium Subscriber
Commitment
Best Of Stats
Fastball
85 - 89
Velo Range
2/06/21
2317
Spin Rate (avg)
2/06/21
Changeup
81 - 81
Velo Range
2/06/21
1779
Spin Rate (avg)
2/06/21
Curveball
72 - 74
Velo Range
2/06/21
2424
Spin Rate (avg)
2/06/21
Slider
72 - 75
Velo Range
9/05/20
2476
Spin Rate (avg)
9/26/20
Positional Tools
Hitting
Hitting
Pitching
2021
2020
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Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
89.9
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
87.5
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).
2317
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.
26.5
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).
72.8
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).
2424
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).
81.1
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).
1779
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
87.5
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
84.3
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).
2291
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).
69.5
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).
2360
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).
73.6
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).
2446
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).
Splitter
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
77.1
Splitter
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).
712
Splitter
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 (2021/2022)
Feb 6, 2021
Trackman - Fastball
89.9
Velocity (max)
86.2 - 88.8
Velo Range
85.1
Eff Velocity (avg)
2,517
Spin Rate (max)
2,317
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
74.0
Velocity (max)
72.0 - 73.6
Velo Range
69.5
Eff Velocity (avg)
2,731
Spin Rate (max)
2,424
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
81.1
Velocity (max)
1,779
Spin Rate (max)
1,779
Spin Rate (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Norcal Uncommitted Senior Games
Sep 26, 2020
Trackman - Fastball
87.5
Velocity (max)
83.2 - 86.4
Velo Range
83.0
Eff Velocity (avg)
2,444
Spin Rate (max)
2,274
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
70.7
Velocity (max)
68.8 - 70.3
Velo Range
66.9
Eff Velocity (avg)
2,420
Spin Rate (max)
2,381
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Slider
74.0
Velocity (max)
74.0 - 74.0
Velo Range
72.2
Eff Velocity (avg)
2,548
Spin Rate (max)
2,476
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Trackman - ChangeUp
83.2
Velocity (max)
81.6
Eff Velocity (avg)
2,159
Spin Rate (max)
2,159
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Splitter
77.1
Velocity (max)
74.4
Eff Velocity (avg)
712
Spin Rate (max)
712
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
BAWS Games 2020
Sep 5, 2020
Trackman - Fastball
87.3
Velocity (max)
82.8 - 85.2
Velo Range
82.4
Eff Velocity (avg)
2,537
Spin Rate (max)
2,300
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Curveball
70.2
Velocity (max)
68.7 - 70.2
Velo Range
66.8
Eff Velocity (avg)
2,527
Spin Rate (max)
2,340
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Slider
75.0
Velocity (max)
72.6 - 74.4
Velo Range
71.6
Eff Velocity (avg)
2,577
Spin Rate (max)
2,440
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Pitch Scores
2021
2020
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.
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.
Norcal Uncommitted Senior Games
Sep 26, 2020
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+
Pitch Scores - Slider
Hammer+
Sweep+
BAWS Games 2020
Sep 5, 2020
Pitch Scores - Fastball
Hop+
Rise+
Sink+
Pitch Scores - Curveball
Hammer+
Sweep+
Pitch Scores - Slider
Hammer+
Sweep+
Pitching Velos
2021
2020
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
89.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
87.0
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
73.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
81.0
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
88.0
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)
69.5
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
73.8
Game Performance
Vizual Edge
Pitch Ai
Notes
News
- First Look: Upperclass Preseason All-State - Feb 22, 2021
- Preseason All-State: Scouting Reports - Upperclass Pitchers - Feb 17, 2021
- Upperclass Preseason All-State Quick Hits - Feb 8, 2021
- NorCal Uncommitted Senior Games: Pitcher Analysis - Oct 20, 2020
- NorCal Uncommitted Senior Games: Quick Hits - Sep 30, 2020
- Bay Area World Series (CA): Uncmtd 2021 RHPs - Sep 24, 2020
Comments
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Body: 6-3, 205-pounds. Square frame, length throughout and strength present. Frame will continue to firm up as he matures.
Delivery: Slower tempo with lift and sit delivery; build momentum and carries arm downhill before exploding on hitters. Gets down the hill and front leg absorbs energy well.
Arm Action: RH. Compact, over the top; ball is hidden for a long time and easy through the slot and out front.
FB: T89.4, 85-89 mph. Firm in the zone and ability to spot down and away; times where he can cut it a bit. Also goes up in zone when needing it.
CB: 72-74 mph. High spin (2731 Max), 12/6 shape with depth into and out of zone. Feel and control of pitch.
SL: 68-69 mph. Similar profile to CB with more horizontal break at the end.
CH: 81 mph. Circle change with downer actions.
Positional Profile: RHP
Body: 6-3, 190-pounds. Tall and broad body type, outstanding frame for future size and strength gains.
Delivery: Simple, starts in stretch, medium knee lift, good direction, falls to 1B side a bit, uses lower half well.
Arm Action: RH. Medium depth on backside, has leverage, overhand slot, hides ball well, strong fast arm.
FB: T88, 83-86 mph. Quick with length through zone, deceptive, has ride, fairly straight but gets swing/miss up in zone.
CB: 69-71 mph. Big 11/6 shape, tight spin, depth to bottom of zone, feel for it, classic overhand CB.
SL: 74 mph. Effective difference from CB, a little harder with lateral break and depth, spins well, capable swing/miss pitch.
CH: 83 mph. Slight differential off FB, showed feel, potential power type change, uses as his fourth pitch.
CUT: 77 mph.
Bay Area World Series 2020 (BAWS) - Uncommitted; Big frame, seemed to get stronger as he went over his 3 IP, FB steady 85-87 (max 2536 spin, 2300 avg spin), feel for both CB (max 2527 spin, avg 2339) and SL (2577 max spin, avg 2440), high slot and appeared to difficult for hitters to square up, outstanding mound presence as well.