@bkellner_9 
24.2
Hand Speed (max)
2/26/23
CLASS OF 2025
SS
3B
Boston
Kellner
Texas A&M
Hamilton (HS) • AZ
6' 0" • 200LBS
R/R • 19yr 4mo
Travel Team: Canes National Met Scout Team
Hamilton (HS) • AZ
6' 0" • 200LBSR/R • 19yr 4mo
Travel Team: Canes National Met Scout Team
Rankings
2025 National
Rankings available to Premium Subscriber
2025 State
Rankings available to Premium Subscriber
Commitment
Best Of Stats
75.6
Bat Speed (max)
2/26/23
15.4
Rot. Acc (max)
2/26/23
90
Hard Hit %
2/26/23
98.9
Exit Velocity (max)
2/26/23
94.6
Exit Velocity (avg)
2/26/23
359
Distance (max)
6/02/24
100
Sweet Spot %
2/26/23
6.96
60-yd
6/02/24
3.91
30-yd
6/02/24
1.67
10-yd
2/26/23
20.1
Run speed (max)
6/02/24
90
INF Velo
2/26/23
-
OF Velo
-
C Velo
-
Pop Time
Fastball
90
Velocity (max)
6/02/24
88 - 90
Velo Range
6/02/24
2091
Spin Rate (avg)
6/02/24
Changeup
83.5 - 84.3
Velo Range
6/02/24
2034
Spin Rate (avg)
6/02/24
Curveball
73 - 76
Velo Range
6/08/23
-
Spin Rate (avg)
Slider
76.8 - 78.5
Velo Range
6/02/24
2321
Spin Rate (avg)
6/02/24
Positional Tools
2024
2023
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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).
84.0
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
6.97
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
90.0
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.
14.2
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).
98.9
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
91.7
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
359
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
228
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
16.536
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).
98.9
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
94.6
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
330
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
255
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
21.0981
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.
2024 ProCase - West
Jun 2, 2024
Trackman - Hitting
98.9
Exit Velocity (max)
91.7
Exit Velocity (avg)
228
Distance (avg)
359
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2023 Preseason All-State (Invite-Only)
Feb 26, 2023
Trackman - Hitting
98.9
Exit Velocity (max)
94.6
Exit Velocity (avg)
255
Distance (avg)
330
Distance (max)
Hard Hit %
Barrel %
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.
23.1
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
22.2
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
74.3
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
71.1
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.
24.2
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
23.0
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
75.6
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
72.3
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.
2024 ProCase - West
Jun 2, 2024
Blast - Hitting
23.1
Hand Speed (max)
22.2
Hand Speed (avg)
74.3
Bat Speed (max)
71.1
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2023 Preseason All-State (Invite-Only)
Feb 26, 2023
Blast - Hitting
24.2
Hand Speed (max)
23.0
Hand Speed (avg)
75.6
Bat Speed (max)
72.3
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2024
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
90.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
89.0
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).
2091
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.
23.5
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).
83.9
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).
2034
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).
77.6
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).
2321
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).
2024 ProCase - West
Jun 2, 2024
Trackman - Fastball
90.0
Velocity (max)
88.4 - 89.6
Velo Range
87.2
Eff Velocity (avg)
2,152
Spin Rate (max)
2,091
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Slider
78.7
Velocity (max)
76.8 - 78.5
Velo Range
75.6
Eff Velocity (avg)
2,402
Spin Rate (max)
2,321
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - ChangeUp
84.3
Velocity (max)
83.5 - 84.3
Velo Range
82.5
Eff Velocity (avg)
2,041
Spin Rate (max)
2,034
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
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
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
2024
2023
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
90.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
89.0
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
83.5
Slider
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).
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)
86.5
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
74.5
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
Game Performance
2024
2023
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.78
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
3.91
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
6.96
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
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.
1.68
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
6.97
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
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.
2024 ProCase - West
Jun 2, 2024
Swift
1.78
10-yd
3.91
30-yd
6.96
60-yd
20.1
Run speed (max)
1.41
RSI (max)
26.3
Jump Height (max)
2023 Preseason All-State (Invite-Only)
Feb 26, 2023
Swift
1.67
10-yd
6.97
60-yd
19.3
Run speed (max)
1.43
RSI (max)
1.43
RSI (avg)
1,593
Jump Power (max)
26.6
Jump Height (max)
26.6
Jump Height (avg)
Vizual 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.
80.61
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.
72.21
Pitch Ai
Notes
News
- AIA Scout Blog: 5/16 Playoffs - May 17, 2025
- AIA Scout Blog: 5/6 Playoffs - May 8, 2025
- AIA Scout Blog: 4/21 - 4/25 - Apr 22, 2025
- Signing Day Report: 10 to Know - Nov 13, 2024
- Dickerson Doppelgangers: 9 Breakout Seniors To Know - Aug 21, 2024
- 2024 ProCase - West: TrackMan Pitching Leaders - Jun 4, 2024
- Week 6 Game Recap: #1 Hamilton vs. #5 Basha - Apr 5, 2024
- Prep Baseball Arizona: Player of the Week (March 11-17) - Mar 18, 2024
- 2025 Spring Rankings Update - Feb 23, 2024
- #2 Hamilton Huskies: Preseason Preview - Feb 21, 2024
- 2023 Rewind: Infield Velocity - Dec 19, 2023
- Colorado 2025 Class Rankings: Summer Update - Aug 30, 2023
- PBR Colorado All-State Team - Jun 24, 2023
- Colorado 2025 Class Rankings: Spring 2023 Update - May 17, 2023
- Colorado's Most Viewed Profiles - April - May 8, 2023
- Colorado's Most Viewed Profiles of March - Apr 5, 2023
- Preseason All-State - Quick Hits - Mar 4, 2023
- Colorado's Most Viewed Profiles of February - Mar 2, 2023
- Colorado Preseason All-State: Statistical Leaderboard - Mar 1, 2023
- Colorado Preseason All-State: TrackMan Hitting Leaderboard - Feb 28, 2023
- Colorado's Most Viewed Profiles of January - Feb 2, 2023
- Colorado's 50 Most Viewed Profiles of 2022 - Dec 26, 2022
- Colorado 2025 Rankings: Fall Update - Dec 8, 2022
- Colorado's 25 Most Viewed Profiles - November - Dec 2, 2022
- CO's 25 Most Viewed Profiles of September - Oct 2, 2022
- Colorado's Most Viewed Profiles of August - Sep 1, 2022
- Colorado Class of 2025: Initial Rankings - Aug 30, 2022
- Colorado's Most Viewed Profiles (June) - Jul 4, 2022
- Mile High Crosscheck - April 4-8 - Apr 10, 2022
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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.
Kellner showed off his all around game, this time at the plate, contributing with 2 hits and driving in a key run with a short, quick, powerful swing to keep Hamilton in striking distance. Veteran presence at the top of the order with a quick swing and ability to spray the field.
Boston shows a great deal of upside for a 2025 graduate, the RHP shows a fastball that demonstrates good life and carry, he worked at 85-86 touching 88. He has a fairly compact delivery that is repeatable and does not have a lot of moving parts.
His arm appears to work well without a great deal of effort. His breaking ball was 72-74 with the ability to freeze hitters and showed some good depth. Boston is a strike thrower with a good arm and should develop into one of the premier arms in his class. There is a great deal of positive potential for this young pitcher as you try to project into the future.