X
Lost password?

Don't have an account?
Gain Access Now

X

Receive free daily analysis

NFL
NBA
NHL
NASCAR
CFB
MLB
MMA
PGA
ESPORTS
BETTING

Already have an account? Log In

X

Forgot Password


POPULAR FANTASY TOOLS

Expert Advice
Articles & Tools
Import Your Leagues
Daily Stats & Leaders
All Pitcher Matchups
Compare Any Players
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

Identifying Top MLB Pitching Prospects - Exploring Minor League Plate Discipline Data

fantasy baseball prospects MLB prospects rookies call-ups

Jordan Rosenblum analyzes minor league plate discipline metrics including whiff % for pitching prospects.

Last week, we published an article on minor league plate discipline metrics for MLB prospect hitters, covering contact %, swinging strike %, swing %, foul strike %, called strike %, and ball %.

This article today looks at the same set of metrics but for pitchers. The full minor league plate discipline leaderboards will continue to be updated monthly (they can be found here, at Scout the Stat Line).

Be sure to also check out more RotoBaller articles focused on advanced sabermetrics for fantasy baseball right here.

Be sure to check all of our fantasy baseball lineup tools and resources:

 

What insight can we glean from plate discipline metrics for pitchers?

While BB% and K% themselves are sticky, reliable metrics for pitchers that are indicative of talent in relatively small samples, plate discipline metrics like whiff % are even more reliable, and thus particularly useful in smaller samples.

Further, comparing a pitcher’s BB% and K% with their plate discipline metrics can isolate outliers who deserve a better BB% or K% given their plate discipline metrics. For instance, pitchers with a high whiff % tend to also have a strong K% minus BB%: across the minor leagues (minimum 500 pitches), whiff %, and K% minus BB% are strongly correlated at .71.

Finally, K% minus BB% is a key single metric of pitching talent that at least holds its own when faced up against more complicated metrics with good predictive power like SIERA or xFIP.

 

Expected K% minus expected BB%

To analyze whether a pitcher’s K% minus BB% is consistent with their “deserved,” or expected K% minus BB% given their plate discipline metrics, I produce an expected K% minus BB% metric that shows the expected value of a pitcher’s K% and BB% given their whiff % (whiffs divided by swings), called strike % (called strikes divided by total pitches), foul strike % (foul strikes divided by total pitches), and swing % (swings divided by total pitches).

Each of these four plate discipline metrics is strongly associated with a higher K% minus BB%. Together, they explain 84% of the variance (r-squared) in K% minus BB% (n = 1552 players in 2022 across the minor leagues with a minimum of 750 TBF). If a pitcher has a better K% minus BB% than expected K% minus BB%, they are benefiting from some combination of luck (in terms of sequencing, for example) and skill not captured by these four metrics (in the future, I will bring in location to differentiate between pitches in the zone and out of the zone).

 

Looking at the data on some noteworthy pitching prospects

The table below shows plate discipline metrics and expected K% and BB% for a group of pitching prospects (sorted alphabetically) that has made a lot of noise this year both in terms of performance and scouting buzz.

The Marlins’ Eury Perez has one of the top expected K% minus BB%s at Double-A, despite being one of the youngest pitchers at the level. His strong expected K% minus BB% is driven by an elite 37% whiff % (my whiff % follows Baseball Savant, including foul tips because they are similar enough to whiffs), well above the 29% minor league average. Perez also fills the strike zone: his ball % is very low at 30%, eight percentage points below the minor league average.

Toronto’s Ricky Tiedemann has been soaring through industry prospect rankings as perhaps this year’s biggest breakout pitching prospect. His plate discipline metrics very much validate the hype: he broke Class A with a 45 whiff %, and he hasn’t slowed down much at High-A with his 35 whiff %. His 34% xK% minus xBB% at Class A is among the top-five strongest in the minors this year, and his 25% xK% minus xBB% at High-A is almost as elite.

 

Conclusion

Readers are already accustomed to accounting for plate discipline metrics when analyzing major league pitchers, looking at things like whiff % to measure pitcher talent and better understand how sustainable a pitcher’s K% and BB% are.

The same data is available at the minor league level, but it has for a long time not been easily accessible: it requires some sort of statistical analysis software to access. With the new minor league plate discipline leaderboards featured in this article, readers can now dig deeper when analyzing minor league talent.



Download Our Free News & Alerts Mobile App

Like what you see? Download our updated fantasy baseball app for iPhone and Android with 24x7 player news, injury alerts, sleepers, prospects & more. All free!



More Fantasy Baseball Advice




POPULAR FANTASY TOOLS

Expert Advice
Articles & Tools
Import Your Leagues
Daily Stats & Leaders
All Pitcher Matchups
Compare Any Players
Compare Any Players
Rookies & Call-Ups
24x7 News and Alerts

REAL-TIME FANTASY NEWS

Jake Burger

to Miss an Additional 2-3 Weeks
TreVeyon Henderson

Signs Rookie Contract
Christian Watson

Goes on PUP List
Austin Riley

Hopes to be Activated Next Week
Ketel Marte

Lands on Restricted List After Burglary
Ricky Pearsall

Heads to PUP List
Brandon Aiyuk

Placed on PUP List
Luther Burden III

Signs Rookie Deal
Washington Nationals

Eli Willits Expected to Sign Contract on Saturday
Grayson Rodriguez

Being Shut Down Again - Will We See Him Again This Year?
Ezequiel Tovar

Activated and Back in Lineup on Friday
Max Fried

"Hopeful" to Pitch Next Week - Looks Like He'll Avoid IL Stint
Steven Kwan

Receives Injection in Wrist, Considered Day-to-Day
CJ Abrams

Back to Start Second Half
Alec Bohm

Back From Rib Injury on Friday
Trey Hendrickson

Holdout to Spill into Regular Season?
Jalen McMillan

Bucs Offensive Coordinator Not Forgetting About Jalen McMillan
Levi Onwuzurike

to Miss at Least Four Games
Nick Emmanwori

Seahawks, Nick Emmanwori Reach Agreement on Rookie Deal
Max Holloway

Set For Main Event
Brandon Lowe

Back From 10-Day Injured List
Dustin Poirier

Set For His Final UFC Fight
Roman Kopylov

Set For Co-Main Event
Paulo Costa

Returns At UFC 318
Luis L. Ortiz

to Remain on Leave for Another Month - Will he Pitch Again?
Daniel Rodriguez

Looks For Third Win In A Row
Kevin Holland

Set For His Fourth Fight This Year
Dan Ige

Looks To Win Back-To-Back Fights
MMA

Patricio Freire Set For His Second UFC Fight
Daniel Zellhuber

Set To Open Up UFC 318 Main Card
Michael Johnson

Looks For Third Consecutive Win
Elijah Arroyo

Signs Rookie Deal
Jaydon Blue

Described as "Borderline Lazy"
T.J. Sanders

Bills Sign T.J. Sanders to Rookie Deal
Christian Wilkins

Raiders Put Christian Wilkins on PUP List
Jabari Small

Lions Add Jabari Small to Backfield
Quinshon Judkins

Remains Unsigned, Won't Report With Rest of Rookies
Mason Taylor

Agrees to Rookie Contract with Jets
Hendon Hooker

Leading Lions QB2 Battle Entering Training Camp
Ozzy Trapilo

Agrees to Rookie Contract with Bears
Tate Ratledge

Agrees to Rookie Contract with Lions
Jack Bech

Signs Rookie Contract with Raiders
Yegor Chinakhov

Requests Trade
Dakota Joshua

Maple Leafs Acquire Dakota Joshua
Lukas Dostal

Signs Five-Year Extension with Ducks
Shemar Stewart

Not Practicing With College Team
Eugenio Suárez

Eugenio Suarez Expected Back Friday
Damian Lillard

Returning to Portland
Paul Skenes

Pirates Could Preserve Paul Skenes in Second Half
Brooks Barnhizer

Grabs 19 Points, Nine Boards in Summer League Win
Jeremiah Fears

Scores 22 Points in Summer League Loss to Thunder
Isaiah Collier

Collects 17 Points In Summer League Win
Caleb Houstan

Joins Hawks
AJ Johnson

Erupts for 25 Points in Summer League Loss
Washington Wizards

Leaky Black Logs Double-Double in Loss to Jazz
Connor Norby

Undergoes Surgery, Expected to Miss 6-8 Weeks
Trey Alexander

Tallies 25 Points in Losing Effort
Johni Broome

Records Second Consecutive Double-Double
Jahmir Young

Has Historic Summer League Outing
Rob Dillingham

Plays Big Role in Wednesday's Win
Tyrese Proctor

Erupts for 35 Points Against Kings
Cody Williams

Leads Jazz to Victory Against Wizards
LeBron James

Mavs Not Interested in "Gutting its Roster" For LeBron James
Josh Hart

Undergoes a Procedure on Right Finger
Jake Burger

Goes on 10-Day Injured List With Quad Strain
Sal Frelick

Dealing With Grade 1 Hamstring Strain, TBD for Start of Second Half
Chris Sale

Plays Catch
Los Angeles Clippers

Bradley Beal Heading to Los Angeles to Join Clippers After Contract Buyout
Rayan Rupert

Scores 24 Points in Summer League Win
Derik Queen

Collects Third Consecutive Double-Double in Summer League Loss
GG Jackson II

Records 13 Points in Summer League Action on Tuesday
Johni Broome

Logs Double-Double Against Wizards
DaRon Holmes II

Records Double-Double in Summer League Loss to Raptors
Kyle Schwarber

Named All-Star Game MVP
Harris English

Takes Stellar 2025 Performance to The Open Championship
Aldrich Potgieter

Seeks Better Result in Northern Ireland
Cameron Young

Likely to Hang Around at The Open Championship
Cameron Smith

Just Trying to Make the Cut at Royal Portrush
Jordan Spieth

Is Jordan Spieth Still a Natural for Links Style Golf?
Patrick Reed

a Viable Option at The Open Championship
PGA

Sungjae Im Wants to Rebound from Last Experience at Royal Portrush
Xander Schauffele

Looks to Defend His Claret Jug at Royal Portrush
Tony Finau

Trying to Turn Tide at Royal Portrush
Daniel Brown

Seeks a Rebound at The Open Championship
Rory McIlroy

Will be the Most Watched Player This Week at Royal Portrush
Daniel Berger

Trending Poorly as The Open Championship Looms
Clayton Kershaw

Retires Both Batters In ASG Appearance
Eugenio Suárez

Eugenio Suarez Hit In Pinky In All-Star Game, X-Rays Negative
Robert MacIntyre

Hoping to Bounce Back at Open Championship
Shane Lowry

Hopes to Repeat at Royal Portrush
Brian Harman

Hopes to Rekindle Some Magic at the 153rd Open
UTA

Michael Carcone Returns to Utah on One-Year Contract
Bowen Byram

Signs Two-Year Deal with Sabres
Morgan Barron

Jets Re-Sign Morgan Barron for Two Years
PGA

Chris Gotterup Punches Ticket to Royal Portrush With Win at Scottish Open
Bryson DeChambeau

Hopes to Reverse Links Golf Struggle at the 153rd Open
Keegan Bradley

Needs to Find The Weekend at Royal Portrush for Ryder Cup Hopes
Justin Thomas

Finishes Tied For 22nd at Genesis Scottish Open
Scottie Scheffler

Finishes Tied For Eighth at Genesis Scottish Open
Jon Rahm

Finishes in Second at LIV Andalucia
Tallison Teixeira

Suffers First-Round TKO
Derrick Lewis

Scores First-Round TKO
Stephen Thompson

Loses Controversial Split Decision
Gabriel Bonfim

Wins Controversial Split Decision
Calvin Kattar

Gets Outclassed At UFC Nashville
Steve Garcia

Extends His Win Streak
Nate Landwehr

Gets Knocked Out
Morgan Charrière

Morgan Charriere Scores Third-Round Knockout
Austen Lane

Suffers Submission Loss
Vitor Petrino

Scores First-Round Submission In Heavyweight Debut
Tuco Tokkos

Earns His First UFC Win
Chase Elliott

Charges to A Finish of Third At Sonoma
Chase Briscoe

Finishes Second With his First Career Road-Course Top-Five at Sonoma
Christopher Bell

Rollercoaster Day Ends With Top-5 Finish at Sonoma
William Byron

Maintains the Regular-Season Points Lead
Kyle Busch

Earns A Hard-Fought Top-10 Finish At Sonoma
Alex Ovechkin

Not Thinking About Retirement
PIT

Penguins Acquire Arturs Silovs
NHL

Nikolai Kovalenko Returns to Russia
Tyler Reddick

Evades Near Upset to Remain Alive in In-Season Challenge
Ty Gibbs

One of Three Tylers to Make In-Season Challenge Semifinals
Kyle Larson

Curiously Mediocre at Sonoma Before Late-Race Crash
NASCAR

John H. Nemechek Edges Out Teammate to Make In-Season Challenge Semifinal
Alex Bowman

Ty Dillon Bumps Alex Bowman to Advance to In-Season Challenge Semifinal
Shane Van Gisbergen

Can Anyone Beat Shane van Gisbergen at Sonoma?
Tyler Reddick

Better at Sonoma Than Record Shows
Chase Elliott

a Prime DFS Option at Sonoma
Michael McDowell

Struggling a Bit at Sonoma
NASCAR

Christopher Bell Has Never Finished Better Than Ninth at Sonoma
Ryan Blaney

Has Top-10 Upside at Sonoma
NASCAR

Sunday at Sonoma Will Likely Be a Long Race for Bubba Wallace
Kyle Larson

Is A Likely Top-Five Contender for Sonoma
Ryan Preece

Points Position Could Affect Race at Sonoma
Todd Gilliland

Struggling to Find Speed at Sonoma
Ty Gibbs

May be an Underrated Favorite to Compete for the Win at Sonoma
RANKINGS
C
1B
2B
3B
SS
OF
SP
RP

RANKINGS

QB
RB
WR
TE
K
DEF