PITCHf/x

This section focuses on all things PITCHf/X

Francisco Liriano's formerly invaluable slider

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Liriano's slider was one of the best in baseball last season. Getting it back on track is the key to his second half success.

Approaching Pujols

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We've already established that Albert Pujols has seen the cut fastball more often over the last four years, but are teams intentionally approaching him that way, or is it simply a result of the...

Josh Beckett's hip impingement injury

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Due to the large amount of axial and torsional force put upon the hip joint in the act of pitching, the femoroacetabular (hip) impingement injury sustained by Josh Beckett is not an uncommon one.

Hisashi Iwakuma's spectacular splitter

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The Seattle righty has taken his game to the next level in 2014, behind modifications to his pitch selection motivated by shifted preferences. But can he improve further?

Zach Duke: Now with strikeouts!

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Zach Duke wasn't known for eye-popping stuff or terrific numbers. That might have to change.

Does effective velocity help explain Phil Hughes?

2

Phil Hughes is having a great year so far. Is his performance related to the concept of effective velocity?

Are splitter specialists magical?

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Pitchers who throw a lot of splitters look, walk, and talk like normal humans, but that doesn't mean they don't possess magical powers.

Adam LaRoche's quad strain: effects on hitting

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How has Adam LaRoche's recent quad injury affected his swing and hot start to the season?

Hamate fractures and power in the PITCHf/x era

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Do hamate bone fractures permanently sap a hitter of his power?

Does the strike zone shrink in later innings?

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Do umpires have a narrower strike zone in later innings? PITCHf/x data allows for this question to be checked.

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How has Jose Abreu's approach impacted his season?

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Abreu's solid approach at the plate has played a tremendous role in his early season success. His combined patience at the plate and aggressive approach against pitches in the zone has been crucial...

Tommy John surgeries and similarity scores

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We look at similarity scores to find potential differences between pitchers who have had one Tommy John surgery and those who go on to have a second procedure.

Introducing the new Francisco Rodriguez

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K-Rod is back, kind of....

A closer look at Scott Kazmir's triceps tightness

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We look at the role of the triceps muscle in throwing through the lens of Scott Kazmir's last start.

Viewing Masahiro Tanaka Through Similarity Scores

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With Masahiro Tanaka's much-heralded start, many try to find his best comparison as a pitcher. Who is Tanaka's most comparable according to Pitcher Similarity Scores?

Justin Verlander's wOBA split: Cause for concern?

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The season is still very young, but Justin Verlander shows a significant left-right wOBA split for the first time in his career.

Do the best-hitting catchers of 2013 frame well?

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Offense-first catchers are a valuable rarity, but how many of them can also frame pitches? We're taking a look at the top five hitters behind the dish from 2013.

Bullpen workhorses

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Using 70 innings pitched each of the last four years without any starts as our filter, who are the most turned-to bullpen arms?

Did Lester change his release point?

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Anecdotal evidence seemed to suggest that Jon Lester changed his release point in 2013, but does the data back up that claim? What else might be at play in Lester's second half resurgence from last...

Livin' or Dayan?

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Expectations for Dayan Viciedo to be a middle-of-the-lineup power bat were high when the White Sox signed him in 2008; thus far, he has failed to meet them. Could he do it in 2014?

Cliff Lee, Hiroki Kuroda and Avoiding Walks

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We often think of pitchers who have good control and limit walks as ones who throw tons of pitches inside the zone. But, as the contrast between Cliff Lee and Hiroki Kuroda shows, that isn't always...

Pitching (and hitting) backwards in 2013

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Which pitchers threw the most first-pitch breaking balls and offspeed pitches, and which hitters did they throw them to?

The Great Cingrani

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Starters generally need at least two, and often three, good pitches to succeed in the major leagues. But Reds left-hander Tony Cingrani baffled MLB hitters with largely one pitch—a four-seam...

Evaluating Plate Discipline Part Two: Pitchers

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A follow up to last week's Disc Rating, with a focus on pitchers and plate-discipline statistics.

What caused Cliff Lee's renaissance in 2008?

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Taking some old analysis from Mike Fast we can look at what made Cliff Lee's incredible improvement from 2007 to 2008 possible. Lee went from a nobody to the best pitcher in baseball, and we don't...

New Stat: Plate Discipline Rating

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Introducing a new metric -- Disc Rating -- that puts all of the individual categories of plate discipline into one overall rating.

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