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Throughout the history of baseball, the rules of the game have changed frequently as the game continues to evolve. A few typical rules that most professional
Rules_of_baseball
US tort law rule limiting liability for sports teams
American tort law, the Baseball Rule is an exculpatory clause applicable to baseball games with spectators; it holds that a baseball team or its sponsoring
Baseball_Rule
Informal behavioral code followed by some baseball players
There is a set of unwritten rules of baseball that some players and managers follow. The rules often concern gamesmanship and not disrespecting players
Unwritten_rules_of_baseball
Bat-and-ball game
America, where modern baseball developed into organized clubs playing under codified rules by the mid-19th century. Baseball's American origins, as well
Baseball
Offensive position in baseball and softball
who play defense. In Major League Baseball, the position is authorized by Rule 5.11 of the Official Baseball Rules. It was adopted by the American League
Designated_hitter
Business rules for Major League Baseball
The Official Professional Baseball Rules Book governs all aspects of the game of Major League Baseball beyond what happens on the field of play. There
The Official Professional Baseball Rules Book
The_Official_Professional_Baseball_Rules_Book
Baseball rule about certain fly balls
The infield fly rule is a rule of baseball and softball that treats certain fly balls as though caught, before the ball is caught, even if the infielder
Infield_fly_rule
Primary draft by Major League Baseball teams to assign amateur players
The Major League Baseball draft (officially the Rule 4 Draft; also known as the first-year player draft or amateur draft) is the primary mechanism by
Major_League_Baseball_draft
Player selection process in Major League Baseball
The Rule 5 draft is a Major League Baseball (MLB) player draft that occurs each year in December, at the annual Winter Meeting of general managers. The
Rule_5_draft
Baseball rules applying to the field of play
Ground rules are rules applying to the field, objects on and near it, and special situations relating to them, in the game of baseball. Major League Baseball
Ground_rules
Rule that ends a sports event due to an insurmountable lead
States have mercy rules for sports including baseball, softball, American football and association football. However, mercy rules usually do not take
Mercy_rule
Field on which baseball is played
this section refer to those described within the Baseball Rules, under which Major League Baseball is played. The starting point for much of the action
Baseball_field
When a batter safely reaches base
at .372 if they are not. The official rulebook of Major League Baseball states in Rule 10.05: (a) The official scorer shall credit a batter with a base
Hit_(baseball)
Baseball rule that awards two bases due to the ball leaving play
A ground rule double is a baseball rule that awards two bases from the time of pitch to all baserunners including the batter-runner, as a result of the
Ground_rule_double
Illegal pitcher's move in baseball
the Official Baseball Rules that govern professional play in the United States and Canada, as well as NCAA rules governing college baseball, a balk results
Balk
Baseball rules Comparison between cricket and baseball Baseball5's differences from baseball and softball MLB: Official Baseball Rules WBSC: Baseball
Comparison of baseball and softball
Comparison_of_baseball_and_softball
Early formalization of the rules of American baseball
The Knickerbocker Rules are a set of baseball rules formalized by William R. Wheaton and William H. Tucker of the Knickerbocker Base Ball Club in 1845
Knickerbocker_Rules
Former Major League Baseball contractual rule
The bonus rule was a contractual rule affecting major league baseball intermittently between 1947 and 1964, meant to prevent teams from assigning certain
Bonus_rule
Deliberate violation of baseball rules
Baseball personnel have cheated by violating or circumventing the game's rules to gain an unfair advantage against an opponent. Examples of cheating include
Cheating_in_baseball
Target zone for a pitched baseball
planes extending up from the edges of home plate. The official rules of Major League Baseball define the top of the strike zone as the midpoint between the
Strike_zone
Illegally changing the course of play
bizarre rule in baseball". Fox Sports. Retrieved November 21, 2025. 2020 NFHS Baseball Rule Book (PDF). 2019. pp. 123, 124. ISBN 978-1582084480. "Rule 8 -
Interference_(baseball)
North American professional rules
The Official Rules of Major League Baseball is a set of rules set forth by the MLB governing the playing of baseball games by professional teams of Major
Official rules of Major League Baseball
Official_rules_of_Major_League_Baseball
Honorary title in baseball
official rules of Major League Baseball (MLB) only briefly mention the position of team captain. Official Baseball Rule 4.03 Comment (formerly Rule 4.01 Comment)
Captain_(baseball)
Law regarding baseball
from the Rules of Baseball, which are a private codification of rules governing the internal workings of baseball games. Both the early rules (which act
Baseball_law
Type of player substitution involving batting order change
Rule 3.03, which states that "[a] substitute player shall bat in the replaced player’s position in the team’s batting order." Official Baseball Rules
Double_switch_(baseball)
Piece of sports equipment
A baseball bat is a smooth wooden or metal club used in the sport of baseball to hit the ball after it is thrown by the pitcher. By regulation it may
Baseball_bat
Statistic used in baseball and softball
"runs batted in". The 2018 edition of the Official Baseball Rules of Major League Baseball (MLB), Rule 9.04 Runs Batted In, reads: A run batted in is a
Run_batted_in
League for women's baseball teams in the United States
the league, the rules continued to gradually approach those of baseball. By the final season in 1954, the ball was regulation baseball size, the mound
All-American Girls Professional Baseball League
All-American_Girls_Professional_Baseball_League
In baseball and softball, a pitched ball that is contacted by the batter's bat
ball. In baseball, a foul ball counts as a strike against the batter, unless there are already two strikes on the batter, with special rules applying
Batted_ball
Call by the umpire against a batter or runner
In baseball, an out occurs when the umpire rules a batter or baserunner out. When a batter or runner is out, they lose their ability to score a run and
Out_(baseball)
Automatic ending of a game after play can't continue
forfeiture in Major League Baseball (MLB), the score is recorded as 9–0, as stated in rule 2.00 of the Official Baseball Rules issued by the league. The
Forfeit_(baseball)
Foul in baseball
fielder is fielding a hit ball or in possession of the ball. Official Baseball Rule 2.00 defines obstruction as: The act of a fielder who, while not in
Obstruction_(baseball)
International baseball, softball, and Baseball5 governing body
World Baseball Classic Inc. (WBCI) is an organizing committee that organizes the World Baseball Classic and consists of representatives from Major League
World_Baseball_Classic_Inc.
Disruption of heart rhythm from a blow
National Federation of State High School Associations (NFHS) changed their baseball rules to require the catcher to wear a chest protector that meets the NOCSAE
Commotio_cordis
appellations. The Knickerbocker Rules, codified in 1845, are the earliest extant rules from which the evolution of modern baseball can be lineally traced. A
Origins_of_baseball
pitcher is throwing the ball to home plate. Under Rule 5.06 of Major League Baseball's (MLB) Official Rules, a runner acquires the right to an unoccupied
List of Major League Baseball career stolen bases leaders
List_of_Major_League_Baseball_career_stolen_bases_leaders
Baseball statistic
In baseball, a player is credited with a plate appearance (denoted by PA) each time he completes a turn batting. Under Rule 5.04(c) of the Official Baseball
Plate_appearance
Device used in baseball-style games
of baseball, including softball, stickball, and kickball, when a team does not have enough players. Used primarily in schoolyard games, the rule is called
Invisible_runner_rule
Batting technique in baseball or fastpitch softball
A bunt is a batting technique in baseball or fastpitch softball. Official Baseball Rules define a bunt as follows: "A bunt is a batted ball not swung
Bunt_(baseball)
Ball used in the sport of baseball
A baseball is the ball used in the sport of baseball. It consists of a rubber or cork center wrapped in yarn and covered with white natural horsehide or
Baseball_(ball)
Mud used to treat baseballs
firmer grip and better control. Major League Baseball rules require every "pearl", or brand-new baseball, to be rubbed with mud for at least 30 seconds
Baseball_rubbing_mud
one of baseball's more complicated rules. Balks are covered in rule 6.02(a) in the Official Baseball Rules as published by Major League Baseball. Generally
Glossary_of_baseball_terms
only required protective gear for baseball batters is an unsecured helmet (as required in major league baseball rule 1.16); many batters also use elbow
Comparison of baseball and cricket
Comparison_of_baseball_and_cricket
Extended play of baseball
four. Baseball portal Overtime (sports) Longest professional baseball game Major League Baseball (2017). "Rule 7.03(b)". Official Baseball Rules (PDF)
Extra_innings
Baseball pitch locator
zone in baseball games. It is currently used by the KBO League in South Korea, by the Mexican Baseball League, and by Minor League Baseball (MiLB) and
Automated_Ball-Strike_System
Field games played by two opposing teams
September 2021. "Rule Sets - Protoball". protoball.org. Retrieved 18 August 2025. "Hardball Baseball Dictionary | Baseball Almanac". Baseball-almanac.com.
Bat-and-ball_games
Overview of and topical guide to baseball
Baseball bat Baseball (ball) Baseball glove Baseball field Batter's eye Bullpen Infield On-deck Outfield Warning track Baseball rules Balk Baseball field
Outline_of_baseball
Unit of play in baseball, softball, and other similar games
The Dickson Baseball Dictionary. W. W. Norton & Company. "Rule 4.01 to 4.02; 4.00—Starting and Ending a Game" (PDF). Major League Baseball. Archived (PDF)
Inning
Baseball term
League Baseball (MLB), the specific rules concerning the uncaught third strike are addressed in Rules 5.05 and 5.09 of the Official Baseball Rules: On an
Uncaught_third_strike
annual event. Baseball early in the 20th century was characterized by low-scoring games, but the dead-ball era ended in the early 1920s with rule changes and
History_of_baseball
League Baseball career triples leaders List of Major League Baseball career home run leaders "Rule 10.06". Official Baseball Rules. Major League Baseball. "Rule
List of Major League Baseball career doubles leaders
List_of_Major_League_Baseball_career_doubles_leaders
Occurrence within the game of baseball
now become relatively common in Major League Baseball, particularly in blowout games. This has led to rules being implemented to limit the use of position
Pitching_by_position_players
Statistic in baseball
game is for a team to score more runs than its opponent. The Official Baseball Rules hold that if the third out of an inning is a force out of a runner advancing
Run_(baseball)
American baseball player and executive (1814–1899)
other years. As president of the club, Adams was an advocate of rule changes in baseball that resulted in nine-man teams and nine-inning games. When the
Doc_Adams
Type of pitch in baseball
after the umpire called timeout. "OFFICIAL BASEBALL RULES 2019 Edition" (PDF). MLB. Major League Baseball. Retrieved 31 May 2020. "Randy Johnson Kills
No_pitch
Baseball term for a valid batting attempt
(emphasis added). "Official Baseball Rules" (PDF). Major League Baseball (2018 ed.). Office of the Commissioner of Baseball. Archived (PDF) from the original
At_bat
Baseball achievement
rare among starting pitchers. A shutout is defined by Major League Baseball rule 10.18: A shutout is a statistic credited to a pitcher who allows no
Shutout_(baseball)
In baseball, generally, a struck ball that ends up in foul territory
"Rule 2.00. Definition of terms" (PDF). Major League Baseball. Retrieved 2009-06-13. "Official Baseball Rules" (PDF) (2018 ed.). Major League Baseball
Foul_ball
Four-base hit resulting in a run by the batter in baseball
colloquially referred to as a "ground rule double" even though it is uniform across all of Major League Baseball, per MLB rules 5.05(a)(6) through 5.05(a)(9)
Home_run
Baseball statistic
"crowding", home plate. The rule dates from 1887; before that, a pitch that struck the batter was merely a ball. Per baseball official rule 5.05(b), a batter becomes
Hit_by_pitch
Baseball that is played on the intercollegiate level at institutions of higher education
College baseball is baseball played by student-athletes at institutions of higher education. In the United States, college baseball is sanctioned mainly
College_baseball
New York City meeting on baseball rules
clarifications of the pre-existing Knickerbocker Rules and modifications that helped lead to the modern format of baseball games. Among the items formalized were
1857_baseball_convention
1975 iconic article in the University of Pennsylvania Law Review
ineffective attempts at humor". Stevens's subject was the infield fly rule, a rule of baseball added about 1895 to close a loophole which in certain circumstances
The Common Law Origins of the Infield Fly Rule
The_Common_Law_Origins_of_the_Infield_Fly_Rule
the game in the two organizations. The NPB rules are essentially those of the American Major League Baseball (MLB), but technical elements are slightly
Comparison of Major League Baseball and Nippon Professional Baseball
Comparison_of_Major_League_Baseball_and_Nippon_Professional_Baseball
Baseball game speed
regarded as an issue in college baseball and professional baseball. To accelerate the pace of play, leagues have instituted rule changes, such as the implementation
Pace_of_play
International baseball tournament
World Baseball Classic (WBC), also referred to as the World Classic is a quadrennial international baseball tournament sanctioned by the World Baseball Softball
World_Baseball_Classic
Action in baseball
player or players of either team and the catch is made, it shall be allowed. Other sports Catch (cricket) "OFFICIAL BASEBALL RULES, 2025 Edition" (PDF).
Catch_(baseball)
Era in the history of baseball
had in 1918. There is no consensus among baseball historians as to why, but part of the reason lay in rule changes that promoted scoring, such as alterations
Dead-ball_era
Baseball contest stopped to be resumed at a later date
Series) depending on league or tournament rules. Within the Official Baseball Rules of Major League Baseball (MLB), Rule 7.02—"Suspended, Postponed, and Tie
Suspended_game
the two constitute modern Major League Baseball. A number of statistics are defined in the Official Baseball Rules, which task the official scorer with
Baseball_statistics
major leagues between the start of the modern baseball era (considered 1900) and the creation of the bonus rule in 1947. Listed alphabetically. Several of
List of baseball players who went directly to Major League Baseball
List_of_baseball_players_who_went_directly_to_Major_League_Baseball
List of Major League Baseball player drafts
Below are lists of Rule 5 draft results since 1997. Players selected in the Major League Baseball (MLB) phase of the Rule 5 draft must be kept on their
Rule_5_draft_results
Dropping to the ground to try and reach base
the game. Major League Baseball initially suspended Utley for two games for his conduct "in violation of Official Baseball Rule 5.09 (a) (13), which is
Slide_(baseball)
American youth sports organization
Little League Baseball and Softball (officially, Little League Baseball Inc) is a 501(c)(3) nonprofit organization based in South Williamsport, Pennsylvania
Little_League_Baseball
Clock used in baseball to speed play
the introduction of the major league-style shortened time rule by baseball for JABA Baseball". Daily Sports (Japanese newspaper) (in Japanese). via Yahoo
Pitch_clock
Term used in baseball
Tie goes to the runner is a popular interpretation of informal baseball rules, according to which a forced base runner is considered safe when they reach
Tie_goes_to_the_runner
Competitive balance tax in Major League Baseball
Major League Baseball (MLB) has a luxury tax called the Competitive Balance Tax (CBT). In place of a salary cap, the competitive balance tax regulates
Major League Baseball luxury tax
Major_League_Baseball_luxury_tax
rules are essentially those of Major League Baseball (MLB), but technical elements are slightly different: The Nippon league uses a smaller baseball,
Baseball_in_Japan
Condition in which play can proceed
Yankees thus lost that game, but still went on to win the series. "Hit by Pitch Baseball Rule". QCBaseball. 15 October 2016. Retrieved 3 February 2024.
Live_ball_(baseball)
North American professional baseball league
Major League Baseball (MLB) is a professional baseball league in North America composed of 30 teams, divided equally between the National League (NL)
Major_League_Baseball
of baseball in the United States dates to the 19th century, when boys and amateur enthusiasts played a baseball-like game by their own informal rules using
History of baseball in the United States
History_of_baseball_in_the_United_States
Possible state of the ball in baseball
In baseball, the rules state that a batted ball is considered in flight when it has not yet touched any object other than a fielder or his equipment.
In_flight
American independent baseball league
League Baseball allowing MLB to implement changes to Atlantic League playing rules, in order to observe the effects of potential future rule changes
Atlantic League of Professional Baseball
Atlantic_League_of_Professional_Baseball
Removal of a participant due to a violation of the rules
penalty "Rule 9.01(d)". Official Major League Rule Book. Major League Baseball. Retrieved 2009-02-13. "Rule 8.02(d)". Official Major League Rule Book. Major
Ejection_(sports)
International baseball tournament
The 2026 World Baseball Classic was an international professional baseball tournament between 20 national baseball teams, and the sixth iteration of the
2026_World_Baseball_Classic
Bat-and-ball game originating in Britain
South Wales Baseball Association, (still playing under English Baseball Association rules), who in turn were replaced by the Welsh Baseball Union. The
British_baseball
Baseball maneuver
count in any situation). Major League Baseball Rules, Rule 7.08(d) Major League Baseball Rules, Rule 10.08(d) Major League Baseball Rules, Rule 7.10(a)
Tag_up
Hierarchy of professional baseball leagues affiliated with Major League Baseball
Minor League Baseball (MiLB) is a group of professional baseball organizations below Major League Baseball (MLB), constituted of teams affiliated with
Minor_League_Baseball
Baseball play
overturned". Major League Baseball. Archived from the original on April 7, 2014. "Pace-of-game changes, new slide rule adopted". Major League Baseball.
Neighborhood_play
Contractual term in Major League Baseball
player to Minor League Baseball. MLB player transactions are governed by The Official Professional Baseball Rules Book. Rule 2(k), titled "Designated
Designated_for_assignment
American baseball player (born 1997)
professional baseball pitcher for the Los Angeles Angels of Major League Baseball (MLB). He made his MLB debut in 2026 with the Boston Red Sox as a Rule 5 selection
Ryan_Watson_(baseball)
Sequence in which the members of the offense bat against the pitcher
only under the Official Baseball Rules governing substitutions. If a team bats out of order, it is a violation of baseball's rules and subject to penalty
Batting_order_(baseball)
Two baseball games between the same two teams on the same day
catchers, and lack of consensus among players. The Official Baseball Rules used by Major League Baseball (MLB) discuss doubleheaders in section 4.08. The document
Doubleheader_(baseball)
Large leather glove worn by baseball players
"right handed glove". The shape and size of the baseball glove are governed by official baseball rules. Section 3.00 - Equipment and Uniforms specifies
Baseball_glove
Person charged with officiating a baseball game
In baseball, the umpire is the person charged with officiating the game, including beginning and ending the game, enforcing the rules of the game and the
Umpire_(baseball)
Sports venue type
running toward the north or east or some direction between. Major League Baseball Rule 1.04 states that it is "desirable" (but not required) that the central
Ballpark
Method for MLB officials to review on-field decisions
Major League Baseball. While playing the St. Louis Cardinals, Cliff Floyd hit a ball off the top of the left-field scoreboard. Originally ruled a double and
Instant replay in Major League Baseball
Instant_replay_in_Major_League_Baseball
American baseball player (born 2000)
Pitcher of the Month for May". Minor League Baseball. "Chicago White Sox Select Pitcher Shane Smith No. 1 In Rule 5 Draft". forbes.com. Retrieved February
Shane_Smith_(baseball)
Professional sports hall of fame in New York, U.S.
The National Baseball Hall of Fame and Museum, often simply referred to as "Cooperstown", is a history museum and hall of fame located in Cooperstown,
National Baseball Hall of Fame and Museum
National_Baseball_Hall_of_Fame_and_Museum
List of injured baseball players
full implementation of the rule was pushed back to May 2022 due to the COVID-19 pandemic and the 2021–22 Major League Baseball lockout. Placing a player
Injured_list
travel, tourism, insurance
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