Fantasy Baseball Glossary
The Fantasy Baseball Glossary includes terms and abbreviations that are not only used within the fantasy game (such as scoring categories or roster settings) but also referenced in ESPN columns and articles about the game of baseball, players and all things important to the fantasy baseball team manager looking to get an edge on the competition within his league. After all, baseball is a game of stats - have at it!

Definitions of Abbreviations
* = Bats Left-handed
# = Switch Hitter
G = Games
AB = At-Bats
H = Hits
2B = Doubles
3B = Triples
HR = Home Runs
TB = Total Bases
R = Runs
RBI = Runs Batted In
TBB = Total Bases on Balls
IBB = Intentional Bases on Ball
SO = Strikeouts
HBP = Times Hit by Pitches
SH = Sacrifice Hits
SF = Sacrifice Flies
SB = Stolen Bases
CS = Times Caught Stealing
SB% = Stolen Base Percentage
GDP = Times Grounded into Double Plays
Avg = Batting Average
OBP = On-Base Percentage
SLG = Slugging Percentage
BB = Walks
PA = Plate Appearances
RAT = Ratio of AB/HR
RC = Runs Created
RC/27 = Runs Created per 27 outs
Ht = Height
Wt = Weight
Yr = Year
Lg = Minor League Level
POS = Position
GB = Number of Fair Ground Balls Hit (hits, outs and errors)
FB = Number of Fly Balls Hit (excludes line drives)
G/F = Ratio of Grounders to Fly Balls
BFP = Batters Facing Pitchers
#Pit = Number of Pitches Offered to the Hitter
#P/PA = Average Number of Pitches per Plate Appearance


* = Throws Left-handed
G = Games Pitched
GS = Games Started
CG = Complete Games
GF = Games Finished
IP = Innings Pitched
BFP = Batters Facing Pitcher
H = Hits Allowed
R = Runs Allowed
ER = Earned Runs Allowed
HR = Home Runs Allowed
SH = Sacrifice Hits Allowed
SF = Sacrifice Flies Allowed
HB = Hit Batsmen
TBB = Total Bases on Balls
IBB = Intentional Bases on Ball
SO = Strikeouts
WP = Wild Pitches
Sup = Run Support per Nine Innings
IR = Inherited Runners
IRS = Inherited Runners who Scored
QS = Quality Starts
SvOp = Save Opportunities
GB = Groundballs Hit Against the Pitcher (hits, outs and errors)
FB = Fly Balls Hit Against the Pitcher (excludes line drives)
GF = Ratio of Grounders to Flies
Bk = Balks
W = Wins
L = Losses
Pct. = Winning Percentage
ShO = Shutouts
Sv = Saves
ERA = Earned Run Average
Sv = Saves
BB = Walks Issued
Avg = Batting Average Allowed by Pitcher
RAT = Ratio of SO/AB
ShO = Shutouts
WHIP = Walks plus Hits divided by Innings Pitched


% Inherited Score

  • A Relief Pitching statistic indicating the percentage of runners on base at the time a relief pitcher enters a game that he allows to score.

    1st Batter OBP

  • The On-Base Percentage allowed by a relief pitcher to the first batter he faces in a game.

    Active Career Batting Leaders

  • Minimum of 1,000 At Bats required for Batting Average, On-Base Percentage, Slugging Percentage, At Bats Per HR, At Bats Per GDP, At Bats Per RBI, and K/BB Ratio. One hundred (100) Stolen Base Attempts required for Stolen Base Success %. Any player who appeared in 1995 is eligible for inclusion provided he meets the category's minimum requirements.

    Active Career Pitching Leaders

  • Minimum of 750 Innings Pitched required for Earned Run Average, Opponent Batting Average, all of the Per 9 Innings categories, and Strikeout to Walk Ratio. Two hundred fifty (250) Games Started required for Complete Game Frequency. One hundred (100) decisions required for Win-Loss Percentage. Any player who appeared in 1995 is eligible for inclusion provided he meets the category's minimum requirements.

    BA ScPos Allowed

  • Batting Average Allowed with Runners in Scoring Position.

    Baserunners per Nine Innings

  • These are the hits, walks and hit batsmen allowed per nine innings.

    Bases Loaded

  • This category shows a player's batting average in bases loaded situation.

    Batting Average

  • Hits divided by At Bats.

    Blown Saves

  • This is charged any time a pitcher comes into a game where a save situation is in place and he loses the lead.

    Catcher's ERA

  • The Earned Run Average of a club's pitchers with a particular catcher behind the plate. To figure this for a catcher, multiply the Earned Runs Allowed by the pitchers while he was catching times nine and divide that by his number of Innings Caught.

    Cleanup Slugging%

  • The Slugging Percentage of a player when batting fourth in the batting order.


  • This category shows a player's batting average in the late innings of close games: the seventh inning or later with the batting team ahead by one, tied, or has the tying run on base, at bat or on deck.

    Complete Game Frequency

  • Complete Games divided by Games Started.

    Defensive Batting Average

  • A composite statistic incorporating various defensive statistics to arrive at a number akin to batting average. The formula uses standard deviations to establish a spread from best to worst.

    Earned Run Average (ERA)

  • (Earned Runs times 9) divided by Innings Pitched.

    Fielding Percentage

  • (Putouts plus Assists) divided by (Putouts plus Assists plus Errors).

    First Batter Efficiency

  • This statistic tells you the batting average allowed by a relief pitcher to the first batter he faces.

    Game Score

  • A pitcher's Game Score is determined as follows: (1)Start with 50. (2)Add 1 point for eachout recorded by the starting pitcher. (3)Add 2 points for each inning the pitcher completes after the fourth inning. (4)Add one point for each strikeout.(5)Subtract 2 points for each hit allowed. (6)Subtract 4 points for each earned run allowed.(7)Subtract 2 points for an unearned run.(8)Subtract 1 point for a walk. If the starting pitcher scores over 50 and loses, it is a Tough Loss. If he wins with a game score under 50, it's a Cheap Win.

    GDP per GDP Situation

  • A GDP situation exists any time there is a man on first with less than two outs. This statistic measures how often a player grounds into a double play in that situation.

    Go-Ahead RBI

  • Any time a player drives in a run which gives his team the lead, he is credited with a go-ahead RBI.

    Ground/Fly Ratio (Grd/Fly)

  • Simply a hitter's ground balls divided by his fly balls. All batted balls except line drives and bunts are included.


  • A Hold is credited any time a relief pitcher enters a game in a Save Situation (see definition below), records at least one out, and leaves the game never having relinquished the lead.

    Note: a pitcher cannot finish the game and receive credit for a Hold, nor can he earn a hold and a save.

    Inherited Runner

  • Any runner(s) on base when a relief pitcher enters a game are considered "inherited" by that pitcher.

    Isolated Power

  • Slugging Percentage minus Batting Average.

    K/BB Ratio

  • Strikeouts divided by Walks.

    Late & Close

  • A Late & Close situation meets the following requirements:
    1. the game is in the seventh inning or later, and
    2. the batting team is either leading by one run, tied, or has the potential tying run on base, at bat, or on deck.

    Note: this situation is very similar to the characteristics of a Save Situation.

    Leadoff On Base%

  • The On-Base Percentage of a player when batting first in the batting order.

    No Decision (ND)

  • The result when a starter is credited with neither a win nor a loss.


  • On-base percentage plus slugging percentage.

    Offensive Winning Percentage (OWP)

  • The Winning Percentage a team of nine Fred McGriffs (or anybody) would compile against average pitching and defense. The formula: (Runs Created per 27 outs) divided by the League average of runs scored per game. Square the result and divide it by (1+itself).

    On Base Percentage

  • (Hits plus Walks plus Hit by Pitcher) divided by (At Bats plus Walks plus Hit by Pitcher plus Sacrifice Flies).

    Opponent Batting Average

  • Hits Allowed divided by (Batters Faced minus Walks minus Hit Batsmen minus Sacrifice Hits minus Sacrifice Flies minus Catcher's Interference).

    Outfielder Hold Percentage

  • A statistic used to evaluate outfielders' throwing arms. "Hold Percentage" is computed by dividing extra bases taken (by baserunners) by the number of opportunities. For example, if a single is lined to center field with men on first and second, and one man scores while the other stops at second, that is one extra base taken on two opportunities, a 50.0 hold percentage.


  • The divisor for On Base Percentage: At Bats plus Walks plus Hit By Pitcher plus Sacrifice Flies; or Plate Appearances minus Sacrifice Hits and Times Reached Base on Defensive Interference.

    PCS (Pitchers' Caught Stealing)

  • The number of runners officially counted as Caught Stealing where the initiator of the fielding play was the pitcher, not the catcher. Note: such plays are often referred to as pickoffs, but appear in official records as Caught Stealing. The most common pitcher caught stealing scenario is a 1-3-6 fielding play, where the runner is officially charged a Caught Stealing because he broke for second base. Pickoff (fielding play 1-3 being the most common) is not an official statistic.

    Percentage of Pitches Taken

  • This tells you how often a player lets a pitch go by without swinging.

    Percentage of Swings Put In Play

  • This tells you how often a player hits the ball into fair territory, or is retired on a foul-ball out, when he swings.

    Pickoffs (Pk)

  • The number of times a runner was picked off base by a pitcher.

    Pivot Percentage

  • The number of double plays turned by a second baseman as the pivot man, divided by the number of opportunities.

    PkOf Throw/Runner

  • The number of pickoff throws made by a pitcher divided by the number of runners on first base.

    Plate Appearances

  • At Bats plus Total Walks plus Hit By Pitcher plus Sacrifice Hits plus Sacrifice Flies plus Times Reached on Defensive Interference.

    Power/Speed Number

  • A way to look at power and speed in one number. A player must score high in both areas to earn a high Power/Speed Number. The formula: (HR x SB x 2) divided by (HR + SB).

    Quality Start

  • Any start in which a pitcher works six or more innings while allowing three or fewer earned runs.

    Relief Points (Pts)

  • Wins plus saves minus losses

    Run Support Per 9 IP

  • The number of runs scored by a pitcher's team while he was still in the game times nine divided by his Innings Pitched.

    Runs Created

  • A way to combine a batter's total offensive contributions into one number. The formula: (H + BB + HBP - CS - GIDP) times (Total Bases + .26(TBB - IBB + HBP) + .52(SH + SF + SB)) divided by (AB + TBB + HBP + SH + SF).

    Runs/Times on Base

  • This is calculated by dividing Runs Scored by Times on Base

    Save Percentage

  • Saves (SV) divided by Save Opportunities (OP).

    Save Situation

  • A Relief Pitcher is in a Save Situation when upon entering the game with his club leading, he has the opportunity to be the finishing pitcher (and is not the winning pitcher of record at the time), and meets any one of the three following conditions:
    1. he has a lead of no more than three runs and has the opportunity to pitch for at least one inning, or
    2. he enters the game, regardless of the count, with the potential tying run either on base, at bat, or on deck; or
    3. he pitches three or more innings regardless of the lead and the official scorer credits him with a save.


  • Stolen-base attempts against a catcher

    SB Success%

  • Stolen Bases divided by (Stolen Bases plus Caught Stealing).

    Secondary Average

  • A way to look at a player's extra bases gained, independent of Batting Average. The formula: (Total Bases - Hits + TBB + SB) divided by At Bats.

    Slow-A Otherwise known as "Regular A," these full-season minor leagues contain less-experienced professional players. The Slow-A leagues are the Midwest League and South Atlantic League (Sally).

    Slugging Percentage

  • Total Bases divided by At Bats.

    Stolen Base Percentage Allowed

  • This figure indicates how successful opposing baserunners are when attempting a stolen base. It's stolen bases divided by stolen-base attempts.

    Times on Base

  • Hits plus walks plus hit by pitch

    Total Bases

  • Hits plus Doubles plus (2 times Triples) plus (3 times Home runs).

    Win-Loss Percentage or Winning Percentage

  • Wins divided by (Wins plus Losses).

    Zone Rating

  • Simply the percentage of balls fielded by a player in his typical defensive "zone," as measured by STATS reporters.