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Happy Thanksgiving! Regularly Scheduled Articles Will Resume Monday, December 1

Harry Pavlidis 

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10-13

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11

Fox's Fresh Format
by
Harry Pavlidis

07-09

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1

Pitcher Profile: Jake Arrieta
by
Harry Pavlidis

05-15

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0

BP Announcements: Pizza and Prospects: Chicago, May 24
by
Harry Pavlidis

04-07

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0

BP Unfiltered: Pineda is Back
by
Harry Pavlidis

04-03

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2

Pitcher Profile: New Arms (and Pitches) of the Week
by
Harry Pavlidis

03-31

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4

Framing the Future
by
Harry Pavlidis

03-25

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18

Prospectus Preview: NL Central 2014 Preseason Preview
by
Ken Funck and Harry Pavlidis

03-08

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9

BP Announcements: Prospects, Pizza, and More: March 8 at Monti's in Chicago
by
Harry Pavlidis

03-03

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47

Framing and Blocking Pitches: A Regressed, Probabilistic Model
by
Harry Pavlidis and Dan Brooks

12-19

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16

Baseball Prospectus News: A New Direction for Stats at BP
by
Harry Pavlidis

08-30

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5

What Makes a Good Changeup?
by
Harry Pavlidis

07-17

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1

Pitcher Profile: Speeding Up at the Break
by
Harry Pavlidis

05-30

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0

BP Unfiltered: Jeff Samardzija's Mysterious Splitter
by
Harry Pavlidis

05-24

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17

What Makes a Good Changeup?
by
Harry Pavlidis

05-10

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2

What Makes A Good Changeup
by
Harry Pavlidis

05-03

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5

New Arms: Flamethrowers, Hammers, and Knucklers
by
Harry Pavlidis

04-19

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3

Pitcher Profile: Rookie Rotation Arms
by
Harry Pavlidis

04-12

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0

Pitcher Profile: A Pair of Astros
by
Harry Pavlidis

04-03

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6

Dissecting Darvish's Opening Day
by
Jason Cole, Zachary Levine, Ben Lindbergh and Harry Pavlidis

04-01

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1

BP Unfiltered: The Velocity Gainers and Losers of Spring 2013
by
Harry Pavlidis

03-28

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8

Prospectus Preview: These Questions Three: The Maybe-Next-Years
by
Bradford Doolittle and Harry Pavlidis

03-22

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0

Pitcher Profile: A Prospect, a Non-Prospect, and a Blast From the Past
by
Harry Pavlidis

03-15

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5

Pitcher Profile: New Arms of the World
by
Harry Pavlidis

03-08

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2

Pitcher Profile: Four Growing Giants
by
Harry Pavlidis

03-02

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2

BP Unfiltered: Sloan Q&A: Harry Pavlidis On f/x Tracking Data
by
Zachary Levine and Harry Pavlidis

03-01

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3

Pitcher Profile: New Arms of the Week, First Edition
by
Harry Pavlidis

02-22

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10

Pitcher Profile: Aroldis Chapman
by
Harry Pavlidis

02-21

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14

BP Unfiltered: Home Run Rates and Elbow Injuries UPDATED
by
Corey Dawkins, Ben Lindbergh, Harry Pavlidis and Doug Thorburn

02-15

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10

Pitcher Profile: Milwaukee's Rotation Brew
by
Harry Pavlidis

02-06

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0

Pitcher Profile: Johnny Cueto
by
Harry Pavlidis

08-08

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9

PITCHf/x Mailbag: Swing Tendencies on 3-0 Counts
by
Dan Brooks and Harry Pavlidis

07-13

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5

BP Announcements: Normalized Hitter/Pitcher Profiles Have Arrived
by
Dan Brooks and Harry Pavlidis

07-12

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24

Baseball Prospectus News: Introducing the BP Pitcher Profiles
by
Dan Brooks and Harry Pavlidis

07-09

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22

Baseball Prospectus News: Introducing the BP Hitter Profiles
by
Dan Brooks and Harry Pavlidis

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Our own director of data analysis discusses the past and present of the PITCHf/x, HITf/x and FIELDf/x technology and how it can lead to future breakthroughs.

Our own Harry Pavlidis, Baseball Prospectus’ director of data analysis, has been among the most groundbreaking voices when it comes to using the PITCHf/x, HITf/x and FIELDf/x data that Sportvision tracks in major-league and minor-league parks.

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A look at three top 10-pitching prospects who recently made their PITCHf/x debuts in Arizona.

Spring has sprung. The new baseball year brings fresh hope and excitement to fans everywhere. And, as spring training play begins, it also brings some pitchers to Surprise and Peoria, Arizona, two Cactus League towns with PITCHf/x installations.

The Royals and the Rangers share the facility in Surprise, while the Padres and the Mariners create cross-league harmony in Peoria. This arrangement provides a near-daily flow of data from at least one of the parks. All four host teams and their visiting foes are using plenty of pitchers in these early games. We'll take that as an opportunity to review some new arms.

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Can the league's hardest thrower transition successfully to a rotation role?

Two weeks ago, we examined the progress of Johnny Cueto, whose development from raw talent to well-rounded pitcher has rightfully brought high expectations. Today, we turn our attention to another widely acclaimed Reds pitcher: Aroldis Chapman

Chapman is one of the most enticing figures in baseball today. Most fans got their first impression of the flamethrowing lefty in the 2009 World Baseball Classic, when, in a rare dud for the Cuban national team, he failed to escape the third inning of an outing against the eventual champion, Japan.

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Why do pitchers who allow fewer home runs hurt their elbows more often?

If you haven't read Russell A. Carleton's article from Monday on the factors that really predict pitcher injuries, go do that now. Then listen to his subsequent tour of the baseball podcast circuit, from Buster Olney's Baseball Tonight to Ian Miller's and Riley Breckenridge's Prodcast. I'll wait.

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A look at what the Brewers' rotation options offer from a stuff (and beer) perspective.

I like the old cliché, “You go as far as your starting pitching takes you.” It's best to have about seven to nine arms handy to get through the season, because pitchers often get hurt or fail to meet expectations.

Brewers fans may recall a recent season where they barely used six starters. Then, of course, there's last year, when they needed 11. Somewhere in between is normal. For the 2013 Brewers, the question is not if they will go deep into their rotation, but when. And as the summer nears, manager Ron Roenicke will be handing the ball to quite a few young arms.

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Improved maturity and command have been crucial to Johnny Cueto's recent success.

Johnny Cueto spent last season atop the NL Central champion Cincinnati Reds rotation, the culmination of a gradual evolution from erratic bat-missing fly-baller to consistent pitch-to-contact groundball-getter. Not every thrower-to-pitcher transition happens so smoothly, as even the best power-pitching prospects often fail to realize their full potential. But the Reds shepherded Cueto through his maturation process with a nice mix of praise and push, and their patience is being thoroughly rewarded.

Cueto broke camp in 2008 as an undersized righty with a big arm, making his mark early on by painting the corners with an “explosive” fastball. With "clean and loose" arm action and “unbelievable command," Cueto successfully attacked hitters with the hard stuff, amid lingering questions about his secondary offerings.

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In the inaugural PITCHf/x mailbag, Harry and Dan examine how batters and pitchers behave on 3-0 counts.

Dan Brooks and Harry Pavlidis, the minds behind Brooks Baseball and the PITCHf/x Hitter and Pitcher Profiles, will be answering your statistical questions using PITCHf/x data on a regular basis at BP. To submit a question for consideration in their next mailbag, email them at mailbag@brooksbaseball.net or cram your question into 140 characters and send it to @brooksbaseball or @harrypav.


For our first PITCHf/x mailbag, we’ve decided to take a look at a deceptively simple question. We’re not so good at simple, however, so we took lemons and made a small storage building out of them.


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Our new normalization option lets you compare hitters and pitchers to players of the same handedness.

First, thanks for your enormous level of support and feedback for our new Hitter and Pitcher Profiles. Because of your suggestions, we increased the number of sortable statistics to 19, added several new color schemes, changed some of the layout, and added several new multi-sort options. Your feedback makes building new and great tools easier, so thanks!

We want to announce a new option on our tools and briefly describe how it works. This option is “normalization,” which allows you to compare a pitcher or hitter to other similar pitchers or hitters. It works only for a few of the 19 sorts right now—it will work for all of them eventually—but we think that the most instructive sort is “frequency,” so we’ll describe it using that and let you play around with it. We’ve already done some limited “beta testing” of this new feature via Twitter, and people found it really fun and informative, so we’re excited to announce it on Baseball Prospectus. (As an aside, Harry and I often beta new features late at night on Twitter, so you can come follow us and be part of the creative process if you want.)

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A few days after the rollout of the BP Hitter Profiles, we present their companion piece, the Pitcher Profiles.

Last weekend we posted “Hitter Profiles,” which let you look at PITCHf/x data for each hitter in MLB filtered by a bunch of different attributes. Today, we’re posting their companion piece, “Pitcher Profiles.” You can search for pitchers here. As we did for the Hitter Profiles, we’ll be adding a dropdown link to the search interface from the “Statistics” tab on the nav bar at the top of the page.

We think these profiles will revolutionize the way people look at PITCHf/x data. Location is perhaps the most important attribute of a pitch, and the Pitcher Profiles allow you to examine the results of pitches across multiple spatial locations. PITCHf/x data has been available for five years, but we haven’t been able to examine it this way, at least publicly. (There are scouting services that provide this kind of data.) It was the first thing that a scout I talked to asked for.

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We roll out a new feature designed to help you dig deeper into how pitchers approach hitters and how hitters respond.

While reading message boards, sabermetric websites, or newspapers, you’ll often come across contentions like, “So and so is a good low-ball hitter.” While listening to the radio, you’ll be told that a player swings and misses a lot at pitches down and in. Or you might wonder: What’s the cause of a hitter’s dramatic change in performance from season to season? Is it something different about his approach? Is he less effective at getting to pitches in certain parts of the strike zone?

We’re here to help you answer those questions. Today, we’re rolling out a “beta” version of our PITCHf/x-driven Hitter Profiles. Essentially, they create sortable hot/cold zones for every hitter in “the PITCHf/x era” (2007-12). You can sort by AVG, SLG, the BP all-in-one offensive statistic TAv, Swings, Whiffs, and various types of balls in play. You can investigate where and how pitchers have attacked a hitter to see if that’s changed. You can sort by month or by year. You can do platoon splits. And you can switch between any of the pitches identified in the custom-classified Pitch Info LLC database that is also featured in our Pitcher Cards.

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