21.1
Hand Speed (max)
2/18/24
CLASS OF 2027
SS
3B
MASON
SEBASTYANSKI
Marianapolis Prep (HS) • MA
6' 1" • 186LBS
R/R • 17yr 6mo
Travel Team: Evolution Baseball
6' 1" • 186LBS
R/R • 17yr 6mo
Travel Team: Evolution Baseball
Rankings
2027 National
Rankings available to Premium Subscriber
2027 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
76.2
Bat Speed (max)
8/18/24
21.4
Rot. Acc (max)
2/07/26
38
Hard Hit %
8/12/25
97.6
Exit Velocity (max)
8/12/25
89.8
Exit Velocity (avg)
8/12/25
380
Distance (max)
8/12/25
50
Sweet Spot %
2/18/24
7.13
60-yd
2/07/26
-
30-yd
-
10-yd
-
Run speed (max)
84
INF Velo
2/07/26
-
OF Velo
-
C Velo
-
Pop Time
Positional Tools
2026
2025
2024
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.13
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
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.
12.8
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.48
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
81.0
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.
13.1
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.88
Infield Velocity
The athlete's maximum throwing velocity from an infield position in the given event year. Measured in miles per hour (MPH).
79.0
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.
11.0
Hitting
2026
2025
2024
Exit Velocity Max
The highest exit velocity of any batted ball in the given event year. Measured in miles per hour (MPH).
91.3
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
83.7
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
304
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
163
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
14.0108
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).
97.6
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
89.8
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
380
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
271
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
22.5358
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).
87.0
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
78.4
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
317
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
169
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
17.5879
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.
2026 New England ProCase (Invite Only)
Feb 7, 2026
Trackman - Hitting
91.3
Exit Velocity (max)
83.7
Exit Velocity (avg)
163
Distance (avg)
304
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2025 New England Underclass Games 8.12-8.13 (Invite Only)
Aug 12, 2025
Trackman - Hitting
97.6
Exit Velocity (max)
89.8
Exit Velocity (avg)
271
Distance (avg)
380
Distance (max)
Hard Hit %
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2024 Massachusetts Prospect Games
Aug 18, 2024
Trackman - Hitting
84.6
Exit Velocity (max)
73.8
Exit Velocity (avg)
84
Distance (avg)
189
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
2024 Central New England Preseason ID
Feb 18, 2024
Trackman - Hitting
87.0
Exit Velocity (max)
80.7
Exit Velocity (avg)
212
Distance (avg)
317
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2026
2024
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
21.1
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
19.7
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
69.8
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
65.0
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.
21.1
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
19.2
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
76.2
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
65.6
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.
2026 New England ProCase (Invite Only)
Feb 7, 2026
Blast - Hitting
21.1
Hand Speed (max)
19.7
Hand Speed (avg)
69.8
Bat Speed (max)
65.0
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2024 Massachusetts Prospect Games
Aug 18, 2024
Blast - Hitting
20.7
Hand Speed (max)
19.6
Hand Speed (avg)
76.2
Bat Speed (max)
69.1
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
2024 Central New England Preseason ID
Feb 18, 2024
Blast - Hitting
21.1
Hand Speed (max)
19.0
Hand Speed (avg)
68.1
Bat Speed (max)
64.2
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).
73.4
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
72.7
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).
1706
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.
23.4
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).
64.1
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).
1617
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).
68.7
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).
1500
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).
2024 Central New England Preseason ID
Feb 18, 2024
Trackman - Fastball
73.4
Velocity (max)
72.3 - 73.2
Velo Range
71.3
Eff Velocity (avg)
1,790
Spin Rate (max)
1,706
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
64.1
Velocity (max)
64.0 - 64.1
Velo Range
61.6
Eff Velocity (avg)
1,650
Spin Rate (max)
1,617
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
69.4
Velocity (max)
68.1 - 69.3
Velo Range
67.9
Eff Velocity (avg)
1,552
Spin Rate (max)
1,500
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
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
Pitching Velos
Game Performance
2024
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
Pitch Ai
Notes
News
Comments
Draft Reports
Contact
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6-foot-1, 180-pound right-handed hitting middle infielder and right-handed pitcher. The approach in the infield was athletic and appropriate, throwing 81 mph across the diamond with accuracy. The feet are good and he moves through the baseball. The bat had an exit velocity of 98 mph. The setup at the dish was even in base and the front foot steps into the swing. The path is clean and simple to contact. Good looking player.
6-foot, 180-pound right-handed hitting middle infielder and outfielder. He ran a 7.88 sixty at the event. The approach in the infield is solid as he showed a reliable glove. The arm is clean, throwing 78 mph across the diamond. The bat has an exit velocity of 85 mph. The setup at the plate is even in base with the front foot open to start. The front foot closes down as the ball approaches. The hands start low and work through the baseball out of an level swing. The finish is high after contact with the baseball.
Mason Sebastyanski: SS/OF, (2026) Bartlett, MA. 6-foot, 177-pound athletic projectable frame. Projectable at the plate, the hitter recorded an exit velocity of 87 mph. (64.2 mph bat speed average). (19.0 mph hand speed average). Began in an open narrow stance with a controlled load, then used a closed small stride. Bat speed is developing, has a loose swing plane and good extension on his finish. He created loud contact and found multiple barrels. Gap to gap approach. Capable while in the infield, registered his best throw across the diamond at 79 mph; had a natural exchange, developing hands, and developing consistent footwork. Fields the ball out front, movements laterally were developing. Had consistent accuracy to the bag with a high ¾ slot. Recorded a time of 8.1 in the 60-yard dash. (Max spin 1790; Avg 1705).