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| {{ref improve|date=July 2013}}
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| {{sabermetric|formula=<math>WHIP=\frac{BB+H}{IP}</math>}}
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| In [[baseball statistics]], '''walks plus hits per inning pitched''' ('''WHIP''') is a [[Sabermetrics|sabermetric]] measurement of the number of [[Baserunning#Becoming a runner|baserunners]] a [[pitcher]] has allowed per [[Innings pitched|inning pitched]]. Since WHIP reflects a pitcher's propensity for allowing [[Batting (baseball)|batter]]s to reach base, a lower WHIP indicates better performance. WHIP is calculated by adding the number of [[Base on balls|walks]] and [[Hit (baseball)|hits]] allowed and dividing this sum by the number of innings pitched.
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| The stat was invented in 1979 by writer [[Daniel Okrent]], who called the metric "innings pitched ratio" at the time. Okrent excluded [[hit batsmen]] from the numerator of baserunners allowed since Sunday newspapers did not include hit batsmen in their statistical updates.<ref>{{cite news|url=http://www.nytimes.com/2013/06/30/sports/baseball/mariano-rivera-a-singular-pitcher.html?pagewanted=all|title=Mariano Rivera: A Singular Pitcher|newspaper=[[The New York Times]]|first=Joshua|last=Prager|date=2013-06-30|accessdate=2013-07-15|page=SP1|edition=New York}}</ref> WHIP near 1.00 or lower over the course of a [[Major League Baseball schedule|season]] will often rank among the league leaders in [[Major League Baseball]] (MLB).
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| While [[earned run average]] (ERA) measures the [[Run (baseball)|runs]] a pitcher gives up, WHIP more directly measures a pitcher's effectiveness against batters. Unlike ERA, WHIP accounts for pitcher performance regardless of [[Error (baseball)|errors]] and [[unearned run]]s.
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| WHIP is one of the few sabermetric statistics to enter mainstream baseball usage. ([[On-base plus slugging]], or OPS, a comparable measurement of the ability of a hitter, is another example.) It is one of the most commonly used statistics in [[fantasy baseball]] and is standard in fantasy leagues that employ [[Fantasy baseball#Game play|4×4, 5×5, and 6×6 formats]].
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| The lowest single-season WHIP in MLB history is 0.7373 from [[Pedro Martínez]] pitching for the [[Boston Red Sox]] in {{mlby|2000}}, which broke the previous record of 0.77 from [[Guy Hecker]] of the [[Louisville Eclipse]]. [[Cleveland Indians]] right-handed pitcher [[Addie Joss]] currently holds the MLB record for the lowest career WHIP, with a 0.9678 WHIP in 2,327 innings. [[Chicago White Sox]] [[spitball]]er [[Ed Walsh]] ranks second, with a 0.9996 WHIP in 2,964 innings, the lowest career WHIP for a qualified pitcher with 10 or more seasons pitched. Reliever [[Mariano Rivera]] ranks third among qualified pitchers with a career WHIP of 1.000 in 1,283.2 innings, the lowest mark by any pitcher from the [[live-ball era]]. [[Providence Grays]] and [[San Francisco Giants#Early days and the John McGraw era|New York Gothams]] right-hander [[John Montgomery Ward|Monte Ward]] is fourth all time with a career WHIP of 1.0440, followed by Pedro Martínez, whose 1.0544 career WHIP is the lowest of any starting pitcher from the live-ball era.
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| ==See also==
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| *[[List of Major League Baseball leaders in career WHIP]]
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| ==References==
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| {{reflist}}
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| ==External links==
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| *[http://www.baseball-reference.com/leaders/whip_season.shtml Baseball's single-season WHIP leaders]
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| *[http://www.baseball-reference.com/leaders/whip_career.shtml Baseball's all-time WHIP leaders]
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| {{Baseball statistics}}
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| {{DEFAULTSORT:Walks Plus Hits Per Inning Pitched}}
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| [[Category:Pitching statistics]]
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Hi there! :) My name is Royal, I'm a student studying Japanese Studies from Oslo, Norway.
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