88.6
Velocity (max)
2/17/24
CLASS OF 2026
LHP
1B
Colton
Semmelmann
Brookfield Central (HS) • WI
6' 1" • 176.2LBS
L/L • 16yr 4mo
Travel Team: GRB STIKS
6' 1" • 176.2LBSL/L • 16yr 4mo
Travel Team: GRB STIKS
Rankings
2026 National
Rankings available to Premium Subscriber
2026 State
Rankings available to Premium Subscriber
Commitment
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Best Of Stats
Fastball
86.9 - 88.5
Velo Range
2/17/24
2143
Spin Rate (avg)
2/17/24
Changeup
79.5 - 81.5
Velo Range
2/17/24
1983
Spin Rate (avg)
2/17/24
Curveball
71.8 - 74
Velo Range
2/17/24
2421
Spin Rate (avg)
2/17/24
Slider
64 - 66
Velo Range
2/18/23
2187
Spin Rate (avg)
2/18/23
82.6
Exit Velocity (max)
2/18/23
79.5
Exit Velocity (avg)
2/17/24
290
Distance (max)
2/17/24
88
Sweet Spot %
2/17/24
22.9
Hand Speed (max)
2/17/24
66.6
Bat Speed (max)
2/17/24
13.4
Rot. Acc (max)
2/18/23
-
Hard Hit %
7.68
60
2/17/24
-
30-yd
-
10-yd
-
Run speed (max)
80
INF Velo
2/18/23
-
OF Velo
-
C Velo
-
Pop Time
Positional Tools
2024
2023
2021
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.68
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.
10.6
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
8.21
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
80.0
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.
10.1
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
8.96
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
68.0
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.
7.6
Hitting
2024
2023
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
81.2
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
79.5
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
290
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
237
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
22.6
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).
82.6
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
71.0
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
228
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
174
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
27.6
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.
West Milwaukee Preseason ID
Feb 17, 2024
Trackman - Hitting
81.2
Exit Velocity (max)
79.5
Exit Velocity (avg)
237
Distance (avg)
290
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
West Milwaukee Preseason ID
Feb 18, 2023
Trackman - Hitting
82.6
Exit Velocity (max)
71.0
Exit Velocity (avg)
174
Distance (avg)
228
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2024
2023
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
22.9
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
21.6
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
66.6
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
63.7
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.
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
20.4
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
19.6
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
62.8
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
60.2
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.
West Milwaukee Preseason ID
Feb 17, 2024
Blast - Hitting
22.9
Hand Speed (max)
21.6
Hand Speed (avg)
66.6
Bat Speed (max)
63.7
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
West Milwaukee Preseason ID
Feb 18, 2023
Blast - Hitting
20.4
Hand Speed (max)
19.6
Hand Speed (avg)
62.8
Bat Speed (max)
60.2
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2024
2023
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
88.6
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
87.7
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).
2143
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.
24.4
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).
72.9
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).
2421
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).
80.5
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).
1983
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).
80.1
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
78.6
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).
2005
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.
25.5
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).
65.6
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).
2323
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).
73.0
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).
1687
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).
64.7
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).
2187
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).
West Milwaukee Preseason ID
Feb 17, 2024
Trackman - Fastball
88.6
Velocity (max)
86.9 - 88.5
Velo Range
87.8
Eff Velocity (avg)
2,249
Spin Rate (max)
2,143
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
74.4
Velocity (max)
71.8 - 74.0
Velo Range
72.3
Eff Velocity (avg)
2,537
Spin Rate (max)
2,421
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
81.8
Velocity (max)
79.5 - 81.5
Velo Range
80.9
Eff Velocity (avg)
2,073
Spin Rate (max)
1,983
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
West Milwaukee Preseason ID
Feb 18, 2023
Trackman - Fastball
80.1
Velocity (max)
77.2 - 79.9
Velo Range
78.5
Eff Velocity (avg)
2,080
Spin Rate (max)
2,005
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
66.5
Velocity (max)
64.7 - 66.4
Velo Range
64.5
Eff Velocity (avg)
2,410
Spin Rate (max)
2,323
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - Slider
66.3
Velocity (max)
63.5 - 65.8
Velo Range
63.6
Eff Velocity (avg)
2,302
Spin Rate (max)
2,187
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
74.2
Velocity (max)
71.9 - 74.2
Velo Range
73.6
Eff Velocity (avg)
1,784
Spin Rate (max)
1,687
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
2024
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
2024
2023
2022
2021
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)
87.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
72.5
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
79.5
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
80.0
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)
65.5
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)
65.0
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
78.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
77.5
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
68.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
66.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
57.5
Changeup
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
2024
2023
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.
1.88
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.41
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
8.21
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
Vertical Jump
A measure of any athlete's body strength and reach calculated from the flight time divided by the contact time.
West Milwaukee Preseason ID
Feb 18, 2023
Swift
1.88
10-yd
4.41
30-yd
8.21
60-yd
16.2
Run speed (max)
1,006
Jump Power (max)
22.2
Jump Height (max)
21.5
Jump Height (avg)
Visual Edge
2024
2023
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.
79.13
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.
83.0
Pitch Ai
Notes
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Physical
2024
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.
Colton Semmelmann, Brookfield Central (WI), 2026
Positional Profile: LHP/1B
Body: 6-1, 176-pounds. Long levers with more fill coming.
Delivery: Smooth and loose with very good tempo and repeatability, high leg tuck with balance, gets down hill efficiently, high and balanced leg swing finish through home with low effort, ease to overall operation, what it should look like.
Arm Action: LH. Full online arc, up on time, smooth and loose with quickness through release.
FB: T88, 87-88 mph. Lively out of hand, pounds the zone with the fastball through spots. T2249, 2146 average rpm.
CB: 72-73 mph. Confident pitch with depth, 1/7 shape, swing and miss. T2404, 2387 average rpm.
CH: 79-80 mph. Compliments FB, stays straight mostly, can land, out of same window, quality overall. T2073, 1970 average rpm.
ATH: 7.68 runner in the 60. 26.60 max vertical.
Colton Semmelmann, Brookfield Central (WI), 2026
Positional Profile: LHP/1B
Body: 6-1, 176-pounds. Long levers with more fill coming.
Hit: LHH. Easy loose rhythm, natural trigger. Hands rock back into a flat path, elevated the ball up the middle of the field. 63.7 mph bat speed with 11 G's of rotational acceleration.
Power: 81 max exit velocity, averaged 79.5 mph. 290' max distance.
Arm: LH.
ATH: 7.68 runner in the 60. 26.60 max vertical.
Arguably the top ‘pen of the day was brought by the long-levered southpaw LHP Colton Semmelmann (Brookfield Central, 2026). At a lean 6-foot, 176 pounds, Semmelman is a athletic and clean mover downhill, pairing with an ultra-loose arm that brought some lively offerings. His fastball, which sat in the upper-80s and reached 88.6 mph, is a lively pitch in its own right; playing with life out of the hand and through the zone while averaging over 14” of vertical break. Off of his fastball, Semmelman spun in a swing-and-miss breaking ball with sharp 1/7 action and late depth. Rounding out his three-pitch mix was a fading changeup thrown at arm speed and out of the same window as his fastball. Our staff has long been intrigued with Semmelman’s upside on the bump for some time now. After his ‘pen on Saturday it is apparent that he is starting to tap into that upside and it is safe to say he is just starting to scratch the surface of what his ceiling could ultimately be.
LHP/INF Colton Semmelmann (Brookfield Central, 2026), listed at 5-foot-10, 145 pounds, provided our staff another interesting look this past weekend in Waukesha. On the mound, the freshman displayed a quick and loose arm on a fastball that reached an 80.1 mph high, featuring arm-side life. His curveball has 2/8 shape with depth and a sharpness to it, and his feel to spin is advanced for his age, generating rates that exceed 2,400 rpm. Semmelmann’s slider had a similar shape to the curve, and had a max spin rate of 2,302 rpm. To round out his four-pitch arsenal, Semmelmann’s changeup flashed cutter movement and he was able to find it in and around the zone. At the plate, he showed a free and easy swing from the left side.
Positional Profile: LHP/1B
Body: 5-10, 145-pounds. Wiry frame with some projection.
Delivery: Drop and drive delivery, toe closed at landing.
Arm Action: LH. Quick arm, 3/4 slot.
FB: T80, 77-80 mph. Sinking action, firm. T2080, 2005 average rpm.
CB: 65-66 mph. 2/8 shape, tight break. T2410, 2323 average rpm.
SL: 64-66 mph. Similar feel as curveball, tighter spin. T2302, 2187 average rpm.
CH: 72-74 mph. Flashed cutter movement. T1784, 1687 average rpm.
Positional Profile: LHP/1B
Body: 5-10, 145-pounds. Wiry frame with some projection.
Delivery: Drop and drive delivery, toe closed at landing.
Arm Action: LH. Quick arm, 3/4 slot.
FB: T80, 77-80 mph. Sinking action, firm. T2080, 2005 average rpm.
CB: 65-66 mph. 2/8 shape, tight break. T2410, 2323 average rpm.
SL: 64-66 mph. Similar feel as curveball, tighter spin. T2302, 2187 average rpm.
CH: 72-74 mph. Flashed cutter movement. T1784, 1687 average rpm.
Positional Profile: LHP/1B
Body: 5-10, 145-pounds. Wiry frame with some projection.
Hits: LHH. Narrower stock set up with relaxed hands. Easy, controlled move back, gets back to center, flat path on plane, free and easy, hitterish.
Power: 83 max exit velocity, averaged 71 MPH. 228' max distance.
Arm: LH. INF-80 mph.Short arc to 3/4 slot.
Defense: Feel around the bag, feet work.
Run: 8.21 runner in the 60.
Vizual Edge: 83 Edge Score
Positional Profile: LHP/1B
Body: 5-10, 145-pounds. Wiry frame with some projection.
Hits: LHH. Narrower stock set up with relaxed hands. Easy, controlled move back, gets back to center, flat path on plane, free and easy, hitterish.
Power: 83 max exit velocity, averaged 71 MPH. 228' max distance.
Arm: LH. INF-80 mph.Short arc to 3/4 slot.
Defense: Feel around the bag, feet work.
Run: 8.21 runner in the 60.
Vizual Edge: 83 Edge Score
Semmelmann first caught our attention at The Rock during the Summer Championships. There the southpaw impressed with an athletic and repeatable delivery all while running his fastball to the upper 70’s and mixed in a steady amount of big 1/7 breaking balls that earned some awkward swings and misses. Although he isn’t on the initial rankings for this 2026 class, there is no reason why Semmelmann won’t make a big splash in later updates as he continues to develop.
A lanky 5-foot-8, 145-pound southpaw that was impressive for this GRB Rays MKE squad. Semmelmann is an athletic mover on the mound with a loose, whippy arm. He ran his fastball up to 78 mph and sat anywhere from 75-77 mph that played with some arm side run. He coupled this with a big 1/7 breaker that produced many swings and misses. An impressive outing from a young southpaw in Wisconsin’s ‘26 class and Semmelmann will be a name to closely monitor as he starts his prep career.