@SeldenKolkebeck 
89.6
Velocity (max)
3/04/25
CLASS OF 2026
RHP
1B
Selden
Kolkebeck
Old Tappan (HS) • NJ
6' 4" • 200LBS
R/R • 17yr 5mo
Travel Team: Wladyka
6' 4" • 200LBS
R/R • 17yr 5mo
Travel Team: Wladyka
Rankings
2026 National
Rankings available to Premium Subscriber
2026 State
Rankings available to Premium Subscriber
Commitment
Best Of Stats
Fastball
86.2 - 88.8
Velo Range
3/04/25
2430
Spin Rate (avg)
7/01/25
Changeup
78.4 - 80.6
Velo Range
3/04/25
1796
Spin Rate (avg)
9/20/23
Slider
70.4 - 72.3
Velo Range
3/04/25
2461
Spin Rate (avg)
7/01/25
 2.png.PNG)
Positional Tools
Hitting
Hitting
Pitching
2025
2023
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Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
89.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
86.9
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).
2388
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.
27.5
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
79.3
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).
1609
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).
71.2
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).
2457
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).
83.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
82.0
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).
2334
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.
28.5
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).
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
76.1
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).
1608
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).
68.9
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).
2345
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).
New Jersey Top Prospect Games - Session I (Invite-Only)
Jul 1, 2025
Trackman - Fastball
88.3
Velocity (max)
84.4 - 87.9
Velo Range
87.1
Eff Velocity (avg)
2,502
Spin Rate (max)
2,430
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
72.8
Velocity (max)
70.1 - 72.2
Velo Range
70.6
Eff Velocity (avg)
2,589
Spin Rate (max)
2,461
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
80.0
Velocity (max)
78.6 - 79.9
Velo Range
80.6
Eff Velocity (avg)
1,741
Spin Rate (max)
1,680
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
2025 Wladyka Baseball Pitcher Showcase
Mar 4, 2025
Trackman - Fastball
89.6
Velocity (max)
86.2 - 88.8
Velo Range
87.7
Eff Velocity (avg)
2,537
Spin Rate (max)
2,355
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
72.3
Velocity (max)
70.4 - 72.3
Velo Range
69.8
Eff Velocity (avg)
2,506
Spin Rate (max)
2,449
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
81.2
Velocity (max)
78.4 - 80.6
Velo Range
79.3
Eff Velocity (avg)
1,579
Spin Rate (max)
1,556
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
2023 NJ Fall Top Prospect Games (Invite-Only)
Oct 8, 2023
Trackman - Fastball
83.6
Velocity (max)
81.0 - 82.7
Velo Range
81.3
Eff Velocity (avg)
2,390
Spin Rate (max)
2,296
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
70.5
Velocity (max)
68.4 - 70.1
Velo Range
67.5
Eff Velocity (avg)
2,396
Spin Rate (max)
2,330
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
77.8
Velocity (max)
75.6 - 77.5
Velo Range
75.4
Eff Velocity (avg)
1,561
Spin Rate (max)
1,504
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
2023 NJ Fall ID North
Sep 20, 2023
Trackman - Fastball
83.6
Velocity (max)
81.3 - 83.1
Velo Range
81.1
Eff Velocity (avg)
2,451
Spin Rate (max)
2,409
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
69.6
Velocity (max)
67.1 - 69.6
Velo Range
66.1
Eff Velocity (avg)
2,400
Spin Rate (max)
2,366
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
76.1
Velocity (max)
74.7 - 76.0
Velo Range
73.9
Eff Velocity (avg)
1,848
Spin Rate (max)
1,796
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
2023
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
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
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.
Pitching Velos
2023
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
84.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
82.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
76.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.8
Game Performance
2025
Vertical Jump
A measure of any athlete's body strength and reach calculated from the flight time divided by the contact time.
Vizual Edge
Pitch Ai
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Positional Profile: RHP/1B
Body: 6-2, 190-pounds. Tall w/ some physicality.
Delivery: Works quick and up-tempo, clean and athletic mover. Both halves work in sync. Consistent rhythm and tempo.
Arm Action: RH. Long and loose, clean AA.
FB: T84, 81-83 mph. Late sink. T2390, 2296 average rpm.
SL: 68-70 mph. Tight shape, downer action. T2396, 2330 average rpm.
CH: 76-77 mph. Sink and run. T1561, 1504 average rpm.
Positional Profile: RHP/1B
Body: 6-2, 190-pounds. Tall w/ some physicality.
Hit: RHH
Arm: RH.
Positional Profile: RHP/1B
Body: 6-2, 190-pounds. Physical and broad-shouldered.
Delivery: Rhythm and up-tempo, works quick. Both halves work in sync. Engages the back hip on time, rides the slope.
Arm Action: RH. Long, loose and clean. Slightly above 3/4 slot.
FB: T84, 81-83 mph. Late ride in the zone. T2451, 2409 average rpm.
SL: 67-70 mph. Tight spin, late downer bite. T2400, 2366 average rpm.
CH: 75-76 mph. Kills spin, w/ depth. T1848, 1796 average rpm.
Positional Profile: RHP/1B
Body: 6-2, 190-pounds. Physical and broad-shouldered.
Hit: RHH
Arm: RH.