Stephen Sutton-Brown
@srbrown70.bsky.social
Braves, heat maps, cars, tractors, and music
Creator of StuffPro and Arsenal Metrics at Baseball Prospectus
He / him
Creator of StuffPro and Arsenal Metrics at Baseball Prospectus
He / him
it's alive and the wings stay open! for the first time in twenty years!
but millie is not amused
but millie is not amused
December 7, 2025 at 3:31 AM
it's alive and the wings stay open! for the first time in twenty years!
but millie is not amused
but millie is not amused
part time x-wing mechanic
December 7, 2025 at 3:08 AM
part time x-wing mechanic
updated hall of fame shelf and hall of very good shelf
December 6, 2025 at 7:31 PM
updated hall of fame shelf and hall of very good shelf
they each picked out their own outfits this morning
December 6, 2025 at 1:41 AM
they each picked out their own outfits this morning
StuffPro, PitchPro and Arsenal Metrics now available through TruMedia for NCAA teams 👀
If you're with a team and are interested in access please reach out!
If you're with a team and are interested in access please reach out!
December 5, 2025 at 8:55 PM
StuffPro, PitchPro and Arsenal Metrics now available through TruMedia for NCAA teams 👀
If you're with a team and are interested in access please reach out!
If you're with a team and are interested in access please reach out!
who are the schwelly stans ahead of me
December 5, 2025 at 2:05 PM
who are the schwelly stans ahead of me
For example: The slower your bat speed the more likely you are to consistently be behind on fastballs, so next steps will need to be controlling for batter's baseline whiff probability by pitch type. Definitely something here but gonna take more work to refine it.
December 3, 2025 at 7:36 PM
For example: The slower your bat speed the more likely you are to consistently be behind on fastballs, so next steps will need to be controlling for batter's baseline whiff probability by pitch type. Definitely something here but gonna take more work to refine it.
Diff in whiff rate for fastballs vs breaking balls by cumulative fastball timing error
1) Lots of noise!
2) Breaking balls get more whiffs even at extremes
This is before considering some obvious confounders, so most of time it's likely not worth deviating from your game plan.
1) Lots of noise!
2) Breaking balls get more whiffs even at extremes
This is before considering some obvious confounders, so most of time it's likely not worth deviating from your game plan.
December 3, 2025 at 7:23 PM
Diff in whiff rate for fastballs vs breaking balls by cumulative fastball timing error
1) Lots of noise!
2) Breaking balls get more whiffs even at extremes
This is before considering some obvious confounders, so most of time it's likely not worth deviating from your game plan.
1) Lots of noise!
2) Breaking balls get more whiffs even at extremes
This is before considering some obvious confounders, so most of time it's likely not worth deviating from your game plan.
The reverse is also true: if they've consistently been ahead on slow pitches they're more likely to whiff on another slow pitch
December 3, 2025 at 4:40 PM
The reverse is also true: if they've consistently been ahead on slow pitches they're more likely to whiff on another slow pitch
Unsurprisingly, if a batter has consistently been behind on fastballs within an at bat they are more likely to whiff on a fastball and less likely to on a breaking ball than they'd be expected to given a pitch's stuff and location.
December 3, 2025 at 4:38 PM
Unsurprisingly, if a batter has consistently been behind on fastballs within an at bat they are more likely to whiff on a fastball and less likely to on a breaking ball than they'd be expected to given a pitch's stuff and location.
My most played if you exclude kid songs music.apple.com/us/playlist/...
December 3, 2025 at 1:46 AM
My most played if you exclude kid songs music.apple.com/us/playlist/...
we were jamming tbh
December 3, 2025 at 1:31 AM
we were jamming tbh
December 3, 2025 at 1:30 AM
that checks out
December 3, 2025 at 1:29 AM
that checks out
Saw the coolest power wheels car of all time today. Look at those details!
Hand built 3/4 scale model of a Testa Rossa
Hand built 3/4 scale model of a Testa Rossa
December 2, 2025 at 1:37 AM
Saw the coolest power wheels car of all time today. Look at those details!
Hand built 3/4 scale model of a Testa Rossa
Hand built 3/4 scale model of a Testa Rossa
it ain’t much but it’s honest work
November 29, 2025 at 2:13 AM
it ain’t much but it’s honest work
good nuggets here
blogs.fangraphs.com/a-late-seaso...
blogs.fangraphs.com/a-late-seaso...
November 26, 2025 at 2:10 AM
good nuggets here
blogs.fangraphs.com/a-late-seaso...
blogs.fangraphs.com/a-late-seaso...
I can see the pearly gates
Where the angels wait
Standin' all around your big Cadillac
Won't you take me by the hand
Lead me to the promised land
And let me ride in your big Cadillac
Let me ride in your big Cadillac, Lord Jesus
Let me ride in your big Cadillac
Where the angels wait
Standin' all around your big Cadillac
Won't you take me by the hand
Lead me to the promised land
And let me ride in your big Cadillac
Let me ride in your big Cadillac, Lord Jesus
Let me ride in your big Cadillac
November 23, 2025 at 5:37 PM
I can see the pearly gates
Where the angels wait
Standin' all around your big Cadillac
Won't you take me by the hand
Lead me to the promised land
And let me ride in your big Cadillac
Let me ride in your big Cadillac, Lord Jesus
Let me ride in your big Cadillac
Where the angels wait
Standin' all around your big Cadillac
Won't you take me by the hand
Lead me to the promised land
And let me ride in your big Cadillac
Let me ride in your big Cadillac, Lord Jesus
Let me ride in your big Cadillac
not a good sign
November 22, 2025 at 4:58 PM
not a good sign
saving this for future uses
November 22, 2025 at 1:49 AM
saving this for future uses
For their learning bag they were told to bring in a picture of “their favorite spot in the community” and they insisted on pictures of Taco Bell lmao
November 21, 2025 at 3:43 PM
For their learning bag they were told to bring in a picture of “their favorite spot in the community” and they insisted on pictures of Taco Bell lmao
Made a simulator using a simplified version of a pitching model so I can start testing various pitching strategies (changing pitch usage rates by game state, targeting further outside the zone in certain situations, etc.).
Simulated results match reality pretty well!
Simulated results match reality pretty well!
November 21, 2025 at 3:15 PM
Made a simulator using a simplified version of a pitching model so I can start testing various pitching strategies (changing pitch usage rates by game state, targeting further outside the zone in certain situations, etc.).
Simulated results match reality pretty well!
Simulated results match reality pretty well!