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Major League Baseball (MLB) is a professional baseball organization that is the oldest of the four major professional sports leagues in the United States and Canada. A total of 30 teams now play in the American League (AL) and National League (NL), with 15 teams in each league. The AL and NL operated as separate legal entities from 1901 and 1876 respectively. After cooperating but remaining legally separate entities since 1903, the leagues merged into a single organization led by the Commissioner of Baseball in 2000. The organization also oversees Minor League Baseball, which comprises about 240 teams affiliated with the Major League clubs. With the World Baseball Softball Confederation, MLB manages the international World Baseball Classic tournament.
Number of Games Appeared (G): the number of games in which a player has appeared;
At Bat (AB): the number of official at bats by a batter (official at bat defined as the number of plate appearances minus sacrifices, walks and Hit by Pitches;
Runs Scored (R): the number of times a baserunner safely reaches home plate;
Hits (H): the number of times a batter hits the ball and reaches bases safely without aid of an error or fielder's choice;
Double Runs (2B): the number of times a batter hits the ball and reaches second base without aid of an error or fielder's choice;
Triple Runs (3B): the number of times a batter hits the ball and reaches third base without aid of an error or fielder's choice;
Home Runs (HR): the number of times a batter hits the ball and reaches home plate scoring a run either by hitting the ball out of play in fair territory or without aid of an error or fielder's choice;
Run Batted In (RBI): the number of runs that score safely due to a batter hitting a ball or drawing a base on balls;
Base on Balls (BB): the number of walks by a batter (four balls during an at bat);
Strikeouts (SO): the number of strikeouts by a batter (three strikes during an at bat);
Stolen Bases (SB): the number of times a player has stolen a base;
Caught Stealing (CS): the number of times a player has been put out attempting to steal a base;
Average (Hits / At Bat) (AVG): the average number of hits by a batter defined by hits divided by at bats (H/AB);
On-base Percentage (OBP): the number of times each batter reaches base by hit, walk or hit by pitch, divided by plate appearances including at-bats, walks, hit by pitch and sacrifice flies (H+BB+HBP)/(AB+BB+HBP+SF);
Slugging Average (SLG): slugging percentage, the measure of the power of a hitter, total bases divided by at bats (TB/AB);
On-base Plus Slugging (OPS): on-base percentage plus slugging (OBP + SLG);
Intentional Base on Balls (IBB): the number of times a batter was walked intentionally;
Hit by Pitch (HBP): the number of times a batter has been hit by pitch;
Sacrifice (SAC): the number of sacrifice bunts by a batter;
Sacrifice Fly (SF): the number of times a runner tags up and scores after a batter's fly out;
Total Base (TB): the total number of bases i.e. one base for single, two bases for double;
Extra Base Hits (XBH): the total number of doubles, triples and home runs for a batter;
Ground into Double Play (GDP): the number of times a batter has grounded into a double play;
Ground Ball Outs (GO): the number of times a batter has made an out on a ground ball;
Fly Ball Outs (AO): Fly Outs is the total of all fly balls hit by the batter into outs, not including line drives;
Ground Ball Fly Ball Ratio (GO_AO): ratio of outs made by a batter on the ground versus the air;
Pitches Thrown (NP): the total number of pitches thrown during all of the batter's plate appearances;
Plate Appearance (PA): the number of times a batter has appeared at the plate (AB+BB+HBP+SF).
Number of Games Appeared (G): the number of games in which a player has appeared;
At Bat (AB): the number of official at bats by a batter (official at bat defined as the number of plate appearances minus sacrifices, walks and Hit by Pitches;
Runs Scored (R): the number of times a baserunner safely reaches home plate;
Hits (H): the number of times a batter hits the ball and reaches bases safely without aid of an error or fielder's choice;
Double Runs (2B): the number of times a batter hits the ball and reaches second base without aid of an error or fielder's choice;
Triple Runs (3B): the number of times a batter hits the ball and reaches third base without aid of an error or fielder's choice;
Home Runs (HR): the number of times a batter hits the ball and reaches home plate scoring a run either by hitting the ball out of play in fair territory or without aid of an error or fielder's choice;
Run Batted In (RBI): the number of runs that score safely due to a batter hitting a ball or drawing a base on balls;
Base on Balls (BB): the number of walks by a batter (four balls during an at bat);
Strikeouts (SO): the number of strikeouts by a batter (three strikes during an at bat);
Stolen Bases (SB): the number of times a player has stolen a base;
Caught Stealing (CS): the number of times a player has been put out attempting to steal a base;
Average (Hits / At Bat) (AVG): the average number of hits by a batter defined by hits divided by at bats (H/AB);
On-base Percentage (OBP): the number of times each batter reaches base by hit, walk or hit by pitch, divided by plate appearances including at-bats, walks, hit by pitch and sacrifice flies (H+BB+HBP)/(AB+BB+HBP+SF);
Slugging Average (SLG): slugging percentage, the measure of the power of a hitter, total bases divided by at bats (TB/AB);
On-base Plus Slugging (OPS): on-base percentage plus slugging (OBP + SLG);
Intentional Base on Balls (IBB): the number of times a batter was walked intentionally;
Hit by Pitch (HBP): the number of times a batter has been hit by pitch;
Sacrifice (SAC): the number of sacrifice bunts by a batter;
Sacrifice Fly (SF): the number of times a runner tags up and scores after a batter's fly out;
Total Base (TB): the total number of bases i.e. one base for single, two bases for double;
Extra Base Hits (XBH): the total number of doubles, triples and home runs for a batter;
Ground into Double Play (GDP): the number of times a batter has grounded into a double play;
Ground Ball Outs (GO): the number of times a batter has made an out on a ground ball;
Fly Ball Outs (AO): Fly Outs is the total of all fly balls hit by the batter into outs, not including line drives;
Ground Ball Fly Ball Ratio (GO_AO): ratio of outs made by a batter on the ground versus the air;
Pitches Thrown (NP): the total number of pitches thrown during all of the batter's plate appearances;
Plate Appearance (PA): the number of times a batter has appeared at the plate (AB+BB+HBP+SF).
Batting Average (AVG): the average number of hits by a batter defined by hits divided by at bats (H/AB).
W:The number of wins credited to a pitcher
L:The number of losses charged to a pitcher
ERA:The average number of earned runs allowed by a pitcher; total number of earned runs allowed multiplied by 9 divided by the number of innings pitched. ((ERx9)/IP)
GS:Games started as the pitcher
SV:The number of saves credited to a pitcher
SVO:The number of save situation appearances by a pitcher to close a game
IP:The total number of innings pitched by the pitcher. The pitcher is credited for one-third inning for each out he records.
ER:The total number of earned runs allowed by the pitcher.
WHIP:The average number of walks and hits by a pitcher, Hits plus walks allowed divided by innings pitched ((H+W)/IP)
CG:The number of games completed by a starting pitcher
SHO:The number of games completed in which the opposing team fails to score any runs
HB:Hit Batsmen. The number of batters hit by a pitch.
GF:A pitcher is credited with a game finished if he is the last relief pitcher for his team in a game and was not the starting pitcher.
HLD:The number of times a pitcher enters a game in a save situation, pitches .1 IP,does not surrender the lead and does not finish the game
GIDP:The number of times a pitcher induces a batter to ground into a double play
WP:The number of wild pitches thrown by a pitcher
BK:The number of balks by a pitcher
PK:The number of pickoffs by a pitcher
TBF:The total number of batters faced by a pitcher
WPCT:The percentage of games won by the pitcher out of all decisions (W/(W+L))
K_9:The average number of strikeouts per 9 innings by a pitcher (K/9)
BB_9:The average number of walks issued per 9 innings by a pitcher (BB/9)
H_9:The average number of hits allowed per 9 innings by a pitcher (H/9)
K_BB:Number of strikeouts versus walks for a pitcher, strikeouts divided by walks (K/BB)
P_IP:Number of pitches thrown per a pitcher divided by the number of innings pitched (P/IP)
INN:The total number of innings played by a fielder. The fielder is credited for one-third inning for each out recorded while he is on the field defensively.
TC:Total Chances. The total number of putouts and assists credited to the fielder and errors charged to the fielder
PO:A putout is credited to a fielder when catches a fly ball or a line drive, whether fair or foul, catches a thrown ball which puts out a batter or runner, or tags a runner when the runner is off the base to which he legally is entitled.
A:Total Assists
E:Total Errors committed
DP:Total double plays
SBPCT:Stolen Base Percentage. Average stolen bases against, Stolen bases divided by Stolen bases plus Caught stealing (SB/(SB+CS))
PB:Total number of passed balls by a catcher
C_WP:Total number of wild pitches while catching
FPCT:Average of errors per total chances, Put outs plus Assists divided Putouts plus assists plus errors (PO+A)/(PO+A+E)
RF:Range Factor. Total number of outs participated in, divide putouts and assists by number of innings or games played at a position ((PO+A)/INN)
DER:Defensive Efficiency Ratio is the rating of team defensive outs recorded in defensive opportunities. To determine Defensive Efficiency Ratio for a team, divide the total number of hits in play allowed (subtracting home runs and times reached on error) by the total number of defensive opportunities (all balls hit into play, not including home runs), and subtract from one: 1-(((H+ROE)-HR)/(PA-(SO+HBP+HR)))
Number of Games Appeared (G): the number of games in which a player has appeared;
At Bat (AB): the number of official at bats by a batter (official at bat defined as the number of plate appearances minus sacrifices, walks and Hit by Pitches;
Runs Scored (R): the number of times a baserunner safely reaches home plate;
Hits (H): the number of times a batter hits the ball and reaches bases safely without aid of an error or fielder's choice;
Double Runs (2B): the number of times a batter hits the ball and reaches second base without aid of an error or fielder's choice;
Triple Runs (3B): the number of times a batter hits the ball and reaches third base without aid of an error or fielder's choice;
Home Runs (HR): the number of times a batter hits the ball and reaches home plate scoring a run either by hitting the ball out of play in fair territory or without aid of an error or fielder's choice;
Run Batted In (RBI): the number of runs that score safely due to a batter hitting a ball or drawing a base on balls;
Base on Balls (BB): the number of walks by a batter (four balls during an at bat);
Strikeouts (SO): the number of strikeouts by a batter (three strikes during an at bat);
Stolen Bases (SB): the number of times a player has stolen a base;
Caught Stealing (CS): the number of times a player has been put out attempting to steal a base;
Average (Hits / At Bat) (AVG): the average number of hits by a batter defined by hits divided by at bats (H/AB);
On-base Percentage (OBP): the number of times each batter reaches base by hit, walk or hit by pitch, divided by plate appearances including at-bats, walks, hit by pitch and sacrifice flies (H+BB+HBP)/(AB+BB+HBP+SF);
Slugging Average (SLG): slugging percentage, the measure of the power of a hitter, total bases divided by at bats (TB/AB);
On-base Plus Slugging (OPS): on-base percentage plus slugging (OBP + SLG);
Intentional Base on Balls (IBB): the number of times a batter was walked intentionally;
Hit by Pitch (HBP): the number of times a batter has been hit by pitch;
Sacrifice (SAC): the number of sacrifice bunts by a batter;
Sacrifice Fly (SF): the number of times a runner tags up and scores after a batter's fly out;
Total Base (TB): the total number of bases i.e. one base for single, two bases for double;
Extra Base Hits (XBH): the total number of doubles, triples and home runs for a batter;
Ground into Double Play (GDP): the number of times a batter has grounded into a double play;
Ground Ball Outs (GO): the number of times a batter has made an out on a ground ball;
Fly Ball Outs (AO): Fly Outs is the total of all fly balls hit by the batter into outs, not including line drives;
Ground Ball Fly Ball Ratio (GO_AO): ratio of outs made by a batter on the ground versus the air;
Pitches Thrown (NP): the total number of pitches thrown during all of the batter's plate appearances;
Plate Appearance (PA): the number of times a batter has appeared at the plate (AB+BB+HBP+SF).
Batting Average (AVG): the average number of hits by a batter defined by hits divided by at bats (H/AB).
W:The number of wins credited to a pitcher
L:The number of losses charged to a pitcher
ERA:The average number of earned runs allowed by a pitcher; total number of earned runs allowed multiplied by 9 divided by the number of innings pitched. ((ERx9)/IP)
GS:Games started as the pitcher
SV:The number of saves credited to a pitcher
SVO:The number of save situation appearances by a pitcher to close a game
IP:The total number of innings pitched by the pitcher. The pitcher is credited for one-third inning for each out he records.
ER:The total number of earned runs allowed by the pitcher.
WHIP:The average number of walks and hits by a pitcher, Hits plus walks allowed divided by innings pitched ((H+W)/IP)
CG:The number of games completed by a starting pitcher
SHO:The number of games completed in which the opposing team fails to score any runs
HB:Hit Batsmen. The number of batters hit by a pitch.
GF:A pitcher is credited with a game finished if he is the last relief pitcher for his team in a game and was not the starting pitcher.
HLD:The number of times a pitcher enters a game in a save situation, pitches .1 IP,does not surrender the lead and does not finish the game
GIDP:The number of times a pitcher induces a batter to ground into a double play
WP:The number of wild pitches thrown by a pitcher
BK:The number of balks by a pitcher
PK:The number of pickoffs by a pitcher
TBF:The total number of batters faced by a pitcher
WPCT:The percentage of games won by the pitcher out of all decisions (W/(W+L))
K_9:The average number of strikeouts per 9 innings by a pitcher (K/9)
BB_9:The average number of walks issued per 9 innings by a pitcher (BB/9)
H_9:The average number of hits allowed per 9 innings by a pitcher (H/9)
K_BB:Number of strikeouts versus walks for a pitcher, strikeouts divided by walks (K/BB)
P_IP:Number of pitches thrown per a pitcher divided by the number of innings pitched (P/IP)
INN:The total number of innings played by a fielder. The fielder is credited for one-third inning for each out recorded while he is on the field defensively.
TC:Total Chances. The total number of putouts and assists credited to the fielder and errors charged to the fielder
PO:A putout is credited to a fielder when catches a fly ball or a line drive, whether fair or foul, catches a thrown ball which puts out a batter or runner, or tags a runner when the runner is off the base to which he legally is entitled.
A:Total Assists
E:Total Errors committed
DP:Total double plays
SBPCT:Stolen Base Percentage. Average stolen bases against, Stolen bases divided by Stolen bases plus Caught stealing (SB/(SB+CS))
PB:Total number of passed balls by a catcher
C_WP:Total number of wild pitches while catching
FPCT:Average of errors per total chances, Put outs plus Assists divided Putouts plus assists plus errors (PO+A)/(PO+A+E)
RF:Range Factor. Total number of outs participated in, divide putouts and assists by number of innings or games played at a position ((PO+A)/INN)
DER:Defensive Efficiency Ratio is the rating of team defensive outs recorded in defensive opportunities. To determine Defensive Efficiency Ratio for a team, divide the total number of hits in play allowed (subtracting home runs and times reached on error) by the total number of defensive opportunities (all balls hit into play, not including home runs), and subtract from one: 1-(((H+ROE)-HR)/(PA-(SO+HBP+HR)))