79
Velocity (max)
10/26/25
CLASS OF 2027
LHP
Alex
Sieren
George Washington (HS) • CO
5' 11" • 152LBS
L/L • 17yr 5mo
Travel Team: 2027 Colorado Rockies Scout Team
5' 11" • 152LBSL/L • 17yr 5mo
Travel Team: 2027 Colorado Rockies Scout Team
Rankings
2027 National
Rankings available to Premium Subscriber
2027 State
Rankings available to Premium Subscriber
Commitment
UNCOMMITTED
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Best Of Stats
Fastball
75.5 - 78.4
Velo Range
10/26/25
1842
Spin Rate (avg)
10/27/24
Changeup
67.6 - 69.5
Velo Range
10/26/25
1821
Spin Rate (avg)
8/09/25
Curveball
66 - 69
Velo Range
8/09/25
1126
Spin Rate (avg)
8/09/25
Slider
53.6 - 66.7
Velo Range
10/21/23
1957
Spin Rate (avg)
10/26/25
86.5
Exit Velocity (max)
10/27/24
76.3
Exit Velocity (avg)
10/27/24
309
Distance (max)
10/27/24
44
Sweet Spot %
10/21/23
22
Hand Speed (max)
10/27/24
66.8
Bat Speed (max)
10/27/24
13.4
Rot. Acc (max)
10/27/24
-
Hard Hit %
6.99
60-yd
10/27/24
3.96
30-yd
10/27/24
1.72
10-yd
10/27/24
20.2
Run speed (max)
10/27/24
-
INF Velo
78
OF Velo
10/27/24
-
C Velo
-
Pop Time
Positional Tools
2024
2023
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60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
6.99
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
78.0
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.
12.4
60 Yard Dash
The athlete's fastest 60-yard dash time in the given event year. Measured in seconds (s)
7.25
Outfield Velocity
The athlete's maximum throwing velocity from an outfield position in the given event year. Measured in miles per hour (MPH).
63.0
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.
10.8
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).
86.5
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
76.3
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
309
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
173
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
22.5918
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).
78.2
Exit Velocity Avg
Average exit velocity of all batted balls in the given event year. Measured in miles per hour (MPH).
65.3
Distance Max
The highest flight distance of any batted ball in the given event year. Measured in feet (ft).
243
Distance Avg
Average flight distance of all batted balls in the given event year. Measured in feet (ft).
160
Launch Angle Avg
Average launch angle of all batted balls in the given event year. Measured in degrees.
25.3646
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.
Colorado Fall ID
Oct 27, 2024
Trackman - Hitting
86.5
Exit Velocity (max)
76.3
Exit Velocity (avg)
173
Distance (avg)
309
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
PBR Scout Day: Rockies Scout Team
Oct 21, 2023
Trackman - Hitting
78.2
Exit Velocity (max)
65.3
Exit Velocity (avg)
160
Distance (avg)
243
Distance (max)
Sweet Spot %
Line Drive %
Fly Ball %
Ground Ball %
Hitting
2024
Hand Speed Max
The highest Peak Hand Speed of any swing in the given event year.
22.0
Hand Speed Avg
The average Peak Hand Speed for all swings in the given event year.
20.2
Bat Speed Max
The highest Bat Speed of any swing in the given event year.
66.8
Bat Speed Avg
The average Bat Speed for all swings in the given event year.
64.2
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.
Colorado Fall ID
Oct 27, 2024
Blast - Hitting
22.0
Hand Speed (max)
20.2
Hand Speed (avg)
66.8
Bat Speed (max)
64.2
Bat Speed (avg)
Rot. Acc (max)
Rot. Acc (avg)
On Plane Eff (avg)
MaxOnPlaneEfficiency
Pitching
2025
2024
2023
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
79.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
75.7
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).
1793
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.
23.7
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).
67.6
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).
1126
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).
68.8
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).
1182
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).
63.9
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).
1957
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).
66.7
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).
1821
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).
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
75.5
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
72.9
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).
1842
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.
25.3
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).
64.3
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).
812
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).
58.4
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).
1653
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).
61.9
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).
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
69.8
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
67.8
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).
1585
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).
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH).
60.1
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).
1572
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).
55.3
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).
827
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).
Colorado Fall ID
Oct 26, 2025
Trackman - Fastball
79.0
Velocity (max)
75.5 - 78.4
Velo Range
76.2
Eff Velocity (avg)
1,847
Spin Rate (max)
1,782
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
68.4
Velocity (max)
67.3
Eff Velocity (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Trackman - Slider
65.6
Velocity (max)
62.4 - 65.5
Velo Range
62.2
Eff Velocity (avg)
2,024
Spin Rate (max)
1,957
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
69.5
Velocity (max)
67.6 - 69.5
Velo Range
67.8
Eff Velocity (avg)
1,249
Spin Rate (max)
1,182
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Colorado State Games (Invite-Only)
Aug 9, 2025
Trackman - Fastball
77.6
Velocity (max)
74.3 - 76.7
Velo Range
73.6
Eff Velocity (avg)
1,967
Spin Rate (max)
1,795
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
69.6
Velocity (max)
66.3 - 68.6
Velo Range
65.3
Eff Velocity (avg)
1,286
Spin Rate (max)
1,126
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Splitter
67.4
Velocity (max)
66.0 - 67.4
Velo Range
64.2
Eff Velocity (avg)
1,821
Spin Rate (max)
1,821
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Colorado Fall ID
Oct 27, 2024
Trackman - Fastball
75.5
Velocity (max)
71.0 - 74.8
Velo Range
69.0
Eff Velocity (avg)
1,959
Spin Rate (max)
1,842
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
63.0
Velocity (max)
55.7 - 62.4
Velo Range
54.0
Eff Velocity (avg)
1,667
Spin Rate (max)
1,653
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Spin Efficiency % (avg)
Trackman - ChangeUp
64.4
Velocity (max)
64.3 - 64.4
Velo Range
59.7
Eff Velocity (avg)
812
Spin Rate (max)
812
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Trackman - Splitter
61.9
Velocity (max)
57.2
Eff Velocity (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Zone %
PBR Scout Day: Rockies Scout Team
Oct 21, 2023
Trackman - Fastball
69.8
Velocity (max)
66.6 - 69.0
Velo Range
66.5
Eff Velocity (avg)
1,695
Spin Rate (max)
1,585
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
66.7
Velocity (max)
53.6 - 66.7
Velo Range
59.1
Eff Velocity (avg)
1,633
Spin Rate (max)
1,572
Spin Rate (avg)
IVB (max)
IVB (avg)
HM (max)
HM (avg)
Extension (avg)
Release Ht (avg)
Spin Score (max)
Zone %
Spin Efficiency % (avg)
Trackman - Splitter
55.5
Velocity (max)
55.2 - 55.5
Velo Range
54.0
Eff Velocity (avg)
609
Spin Rate (max)
827
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
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
2025
2024
2023
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
79.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
76.2
Curveball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
67.8
Changeup
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.5
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
63.5
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
76.0
Fastball
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)
64.0
Slider
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
59.0
Fastball
Velocity Max
The maximum observed fastball velocity in the given event year. Measured in miles per hour (MPH).
70.0
Fastball
Velocity Avg
The average velocity for all pitches of this type in the given event year. Measured in miles per hour (MPH)
68.0
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.
1.76
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
4.01
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
7.25
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
2024
10 Yard Dash
The athlete's fastest 0-10-yard split time in the given event year. Measured in seconds.
1.72
30 Yard Dash
The athlete's fastest 0-30-yard split time in the given event year. Measured in seconds.
3.96
60 Yard Dash
The athlete's fastest 0-60-yard time in the given event year. Measured in seconds.
7.0
Top Speed (MPH)
The athlete's fastest split time converted to miles per hour.
Vizual Edge
Pitch Ai
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Physical
2025
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.
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.
Positional Profile: LHP/OF
Body: 5-11, 152-pounds. Wiry frame.
Delivery: Uptempo drop and drive delivery. Uses a high leg lift before striding straight down the mound into a balanced landing with some recoil.
Arm Action: LH. Long strong arm action from a high 3/4 slot.
FB: T79, 76-78 mph. Some strikes, keeps its plane. T1847, 1782 average rpm.
CB: 68-68 mph. Developing accuracy, tight 12/6 shape.
SL: 62-65 mph. Feel for modertate spin, rolling left to right break with some gradual drop. T2024, 1957 average rpm.
CH: 68-69 mph. Some strikes, kills spin, keeps its plane. T1249, 1182 average rpm.
Positional Profile: LHP/OF
Body: 5-11, 145-pounds. Lean build with room for added strength.
Delivery: Drop and drive delivery with a deliberate tempo. Uses a moderate leg lift before striding closed into a balanced landing with recoil.
Arm Action: LH. Long strong arm action from a 3/4 slot.
FB: T78, 74-77 mph. Some strikes, keeps its plane. T1967, 1795 average rpm.
CB: 66-69 mph. Mostly strikes, rolling 12/6 shape. T1286, 1126 average rpm.
SPLT: 66-67 mph. Late dropping action.
Positional Profile: LHP/OF
Body: 5-10, 139-pounds. Wiry athletic build with room for added strength.
Delivery: Drop and drive delivery with a deliberate tempo. Uses a high leg lift before striding closed into a balanced landing.
Arm Action: LH. Long loose arm action from a 3/4 slot.
FB: T76, 71-75 mph. Some strikes, some arm side run. T1959, 1842 average rpm.
SL: 56-62 mph. Developing accuracy. T1667, 1653 average rpm.
CH: 64-64 mph. Some strikes, late sink. T812, 812 average rpm.
SPLT: 62-62 mph. Late sink
ATH: 6.99 runner in the 60. Sub 7 runner. 25.30 max vertical.
Positional Profile: LHP/OF
Body: 5-10, 139-pounds. Wiry athletic build with room for added strength.
Hit: LHH. Tall setup with a wide base, front foot open. Some bat wiggle, short leg lift trigger working back to even. Long flat path through the zone, some barrels. 64.2 mph bat speed with 8 G's of rotational acceleration.
Power: 87 max exit velocity, averaged 76.3 mph. 309' max distance.
Arm: LH. OF-78 mph. Moderate stroke from a 3/4 slot.
Defense: Calculated actions defensively.
ATH: 6.99 runner in the 60. Sub 7 runner. 25.30 max vertical.