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Defense Newsbeat

Monday, January 14, 2019

Tangotiger Blog: Nola, Pivetta, Phillies, and pitcher-specific UZR

And, as expected Pivetta was hurt by the Phillies fielders more than any other Phillies pitcher.  Indeed, more than any other pitcher in the league!  The Phillies fielders gave up 24 more hits with Pivetta on the mound.

So, adding it all up:

     
  • Nola allowed 27 fewer hits than the average Phillies pitcher, and that still holds.
  •    
  • Pivetta’s 11 MORE hits when he’s on the mound drops down by 24, so that he really should count as 13 FEWER hits than the average Phillies pitcher. 

And so, that 38 hit gap gets reduced down to 14 hits.

***

Every year we see something like this.  Back in 2011 when I first wrote about this, it was Verlander in the Nola role, and (future Cy Young winners) Scherzer and Porcello in the Pivetta role.

Jim Furtado Posted: January 14, 2019 at 11:21 AM | 2 comment(s)
  Beats: aaron nola, defense, phillies, uzr

Friday, January 11, 2019


Wednesday, January 09, 2019

Phillies defense affects pitchers differently

The publicly available info has improved but still has a way to go before we can make better judgments about how defense impacts pitchers.

Jim Furtado Posted: January 09, 2019 at 09:29 AM | 3 comment(s)
  Beats: defense

Monday, August 13, 2018

Fangraphs: Jackie Bradley, Jr. and the Error Rule

To summarize:

1. The MLB rules state that the part of the error rule about ordinary effort is an objective standard.

2. The part of the error rule that says it’s all dependent on the judgment of the official scorer establishes a subjective standard.

3. Statcast is more 1. than 2.

IMO the standard of “ordinary effort” applies to any part of the fielding process, not the sum total. If a fielder gets an extraordinary jump, runs with extraordinary speed on an unusually efficient route, and then botches the catch, it doesn’t matter that ordinary effort wouldn’t have put him in position to make the catch. A fielder in position to make the catch will, in ordinary effort, make the catch. Failing to catch it, after getting into position, is an error. Failing to get into position to make the catch - through ordinary effort - is not an error.


Thursday, July 26, 2018

J.D. Martinez’s Defense? What The Numbers Really Say

The graphics are goofy; the videos are useful; the conversation is fantastic. A moderate-depth piece from Alex Speier on why some advanced defensive metrics aren’t advanced enough.

“Statcast data has changed the way that internally teams are doing defensive evaluations,” Stern told Martinez. “But to the best of my knowledge, I don’t think very much of that is public, so it hasn’t really changed any of the public-facing numbers that people have access to.”

Martinez had heard similar feedback last year after he was traded from the Tigers to the Diamondbacks. With Detroit, Martinez had graded as well below-average. After his trade, UZR and DRS offered favorable numbers for his work. Martinez recalled a conversation with Arizona head of analytics Mike Fitzgerald in which he discussed the disparity.

“My [UZR] has always been a negative in the outfield,” recounted Martinez. “Then I go to Arizona and my [UZR] is positive. I go, ‘What’s the difference?’ He said, ‘Now we’ve got you positioned right.’ ”


 

 

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