Power
Sample · RHP · 17U starter
Holds mid-90s into the fifth. The fastball is the plan and it works.
Velocity signature98.7 mph
Spin rate2,398 rpm
Extension6.8 ft
Horizontal break7.5 in
Vertical break16.8 in
Pitch Lab
Five numbers.
Five ways to win.
A radar gun answers one question. These five answer the rest. They are the reason two pitchers with the same fastball get outs in completely different ways. Here is what each pitcher type looks like when you rank it against everybody.
Sample data. These are illustrative pitcher profiles, not measured readings, and the pitchers are not real people. Percentiles are stated against the public major-league population.
The measurements
What each one tells you.
A percentile says where a pitch ranks against the whole population, from 0 to 100. Higher is better, and better depends on the pitch: a sinker wants a low vertical break, so the bar being short is the bar working.
- Velocity (mph)
- How hard the fastball is thrown. The loudest number and the least complete one: it is one of five things on this page for a reason.
- Spin rate (rpm)
- Revolutions per minute. Spin is not good on its own; it is the raw material that movement is made from.
- Extension (ft)
- How far down the mound the ball is released. More extension means the hitter sees the ball later, which plays like velocity no radar gun records.
- Horizontal break (in)
- Arm-side run. The movement that turns a barrel into the top half of the ball and a line drive into a ground ball.
- Vertical break (in)
- Induced vertical break: how much the pitch resists gravity relative to a spinless throw. High is a four-seamer at the top of the zone; low is a sinker that disappears.
Sample profiles
Pick a type.
Each card is one pitcher, ranked on all five. The bar marked signature is the measurement that type is defined by, except for the Arsenal Architect, whose whole point is that nothing spikes.
20 sample profiles
Power
Sample · LHP · 16U reliever
One inning at a time, and every pitch of it is hard.
Velocity signature98.3 mph
Spin rate2,356 rpm
Extension6.7 ft
Horizontal break8.6 in
Vertical break15.9 in
Power
Sample · RHP · college starter
Top-of-the-scale arm speed. The secondaries are still catching up.
Velocity signature98.9 mph
Spin rate2,453 rpm
Extension6.9 ft
Horizontal break6.6 in
Vertical break17.7 in
Power
Sample · RHP · 15U two-way
Grown into real velocity this year. The program leads with recovery.
Velocity signature98.0 mph
Spin rate2,313 rpm
Extension6.6 ft
Horizontal break9.4 in
Vertical break15.1 in
Seam Effect
Sample · RHP · 17U starter
Ground ball after ground ball. Nobody squares it up and nobody knows why.
Velocity94.2 mph
Spin rate2,154 rpm
Extension6.5 ft
Horizontal break signature16.8 in
Vertical break8.9 in
Seam Effect
Sample · LHP · 16U starter
Runs it back over the inside corner to right-handed hitters all day.
Velocity93.4 mph
Spin rate2,209 rpm
Extension6.6 ft
Horizontal break signature15.9 in
Vertical break9.9 in
Seam Effect
Sample · RHP · college reliever
The ball dies at the plate. Elite sink, and the command to keep it down.
Velocity95.1 mph
Spin rate2,129 rpm
Extension6.4 ft
Horizontal break signature17.3 in
Vertical break8.3 in
Seam Effect
Sample · RHP · 14U starter
Movement first, velocity later. The most efficient way to pitch at this age.
Velocity92.8 mph
Spin rate2,184 rpm
Extension6.5 ft
Horizontal break signature15.0 in
Vertical break10.5 in
Approach Angle
Sample · RHP · college starter
Gets so far down the mound that 92 arrives like 95.
Velocity95.6 mph
Spin rate2,472 rpm
Extension signature7.2 ft
Horizontal break6.0 in
Vertical break19.2 in
Approach Angle
Sample · LHP · 17U reliever
Low slot, flat plane. Hitters swing under the top of the zone.
Velocity94.8 mph
Spin rate2,435 rpm
Extension signature7.1 ft
Horizontal break7.0 in
Vertical break18.5 in
Approach Angle
Sample · RHP · 16U starter
Long levers, late release. The geometry is doing most of the work.
Velocity96.2 mph
Spin rate2,514 rpm
Extension signature7.2 ft
Horizontal break5.0 in
Vertical break19.7 in
Approach Angle
Sample · RHP · 15U starter
Mid-growth-spurt. The delivery is the thing to re-check every eight weeks.
Velocity93.9 mph
Spin rate2,404 rpm
Extension signature7.1 ft
Horizontal break7.8 in
Vertical break17.9 in
Spin Doctor
Sample · RHP · 17U starter
The breaking ball is a real pitch. The fastball exists to set it up.
Velocity93.7 mph
Spin rate signature2,606 rpm
Extension6.5 ft
Horizontal break12.8 in
Vertical break17.6 in
Spin Doctor
Sample · LHP · college starter
Two-plane break that finishes below the zone. Chase rate does the rest.
Velocity94.5 mph
Spin rate signature2,576 rpm
Extension6.4 ft
Horizontal break11.7 in
Vertical break16.8 in
Spin Doctor
Sample · RHP · 16U reliever
Elite spin for the age group. Volume caps are the whole program.
Velocity93.1 mph
Spin rate signature2,624 rpm
Extension6.6 ft
Horizontal break13.7 in
Vertical break18.3 in
Spin Doctor
Sample · RHP · 15U starter
Repeats the shape pitch to pitch, which is rarer than the spin number.
Velocity95.2 mph
Spin rate signature2,557 rpm
Extension6.5 ft
Horizontal break11.1 in
Vertical break16.1 in
Arsenal Architect
Sample · RHP · college starter
Four pitches, four counts. A hitter never gets the same at-bat twice.
Velocity94.8 mph
Spin rate2,392 rpm
Extension6.6 ft
Horizontal break12.0 in
Vertical break14.9 in
Arsenal Architect
Sample · LHP · 17U starter
Sequencing over stuff. Throws anything for a strike in any count.
Velocity94.1 mph
Spin rate2,356 rpm
Extension6.7 ft
Horizontal break9.8 in
Vertical break16.1 in
Arsenal Architect
Sample · RHP · 16U starter
Undervalued by every radar gun in the stands, and gets outs anyway.
Velocity95.6 mph
Spin rate2,313 rpm
Extension6.6 ft
Horizontal break11.1 in
Vertical break14.3 in
Arsenal Architect
Sample · RHP · 14U starter
Already thinks like a pitcher. The stuff has years left to arrive.
Velocity93.4 mph
Spin rate2,435 rpm
Extension6.5 ft
Horizontal break13.3 in
Vertical break15.5 in
Sample data. These are illustrative pitcher profiles, not measured readings, and the pitchers are not real people. Percentiles are stated against the public major-league population. Percentiles will be recomputed from public Statcast data once the monthly load is live; nothing on this page comes from proprietary club sources.
Which one is you?
The Pitcher-Type Assessment takes two minutes and costs nothing. It will not tell you your spin rate. It will tell you which of these five shapes you are already closest to, and what a programme built for it would work on first.
Take the Pitcher-Type Assessment