Ultimate zone rating (UZR) is a
sabermetric
Sabermetrics (originally SABRmetrics) is the original or blanket term for sports analytics in the US, the empirical analysis of baseball, especially the development of advanced metrics based on baseball statistics that measure in-game activity. ...
statistic used to measure fielding. It compares the event that actually happened (hit/out/error) to data on similarly hit balls in the past to determine how much better or worse the fielder did than the "average" player. UZR divides a
baseball field
A baseball field, also called a ball field or baseball diamond, is the field upon which the game of baseball is played. The term can also be used as a metonym for a baseball park. The term sandlot is sometimes used, although this usually refer ...
into multiple zones and assigns individual fielders responsibility for those zones.
UZR calculations are provided at
FanGraphs
FanGraphs.com is a website run by Fangraphs Inc., located in Arlington, Virginia, and created and owned by David Appelman that provides statistics for every player in Major League Baseball history.
On September 18, 2009, Fangraphs Inc. launched ...
by Mitchel Lichtman.
Proponents of the statistic advise that defense is best judged over three-year spans, as a given year contains a relatively small sample and can result in large statistical swings.
Former
Major League Baseball
Major League Baseball (MLB) is a professional baseball league composed of 30 teams, divided equally between the National League (baseball), National League (NL) and the American League (AL), with 29 in the United States and 1 in Canada. MLB i ...
shortstop
David Eckstein
David Mark Eckstein (; born January 20, 1975) is an American former professional baseball player. He was an infielder in Major League Baseball (MLB) for ten seasons. He played college baseball for the University of Florida and played professiona ...
says "a lot of defense is putting yourself in the right position to make plays." Josh Stein,
San Diego Padres
The San Diego Padres are an American professional baseball team based in San Diego. The Padres compete in Major League Baseball (MLB) as a member club of the National League (baseball), National League (NL) National League West, West Division. ...
director of baseball operations, said UZR "can be skewed if the player is not starting from the exact middle of
ZR's zonechart."
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References
External links
The Fangraphs UZR primer
Fielding statistics
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