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| Major League Baseball rules | |
|---|---|
| Name | Major League Baseball rules |
| Established | 1876 |
| Governing body | Major League Baseball |
| Current version | Professional Baseball Rules (2024) |
| Scope | United States and Canada |
| Website | Official site |
Major League Baseball rules Major League Baseball rules govern professional baseball play in the United States and Canada, defining conduct, equipment, field dimensions, and competition procedures used in the World Series, All-Star Game, and regular season competitions between franchises such as the New York Yankees, Los Angeles Dodgers, and Boston Red Sox. They derive from historical codes developed by organizations including the National Association of Base Ball Players, the National League (baseball), and the American League and are interpreted in contexts involving entities such as the Players Association (MLBPA), the Commissioner's Office (MLB), and the Baseball Hall of Fame institutions.
The evolution of contemporary rules traces to 19th‑century precedents like the Knickerbocker Rules and disputes resolved by the National Agreement (baseball) and the formation of the National League (baseball) in 1876, followed by consolidation with the American League and governance changes after the World Series (1903) era. Landmark adjustments occurred after incidents such as the Black Sox Scandal and reforms led by commissioners including Kenesaw Mountain Landis, Ford Frick, and Bowie Kuhn, with later modernization under Bud Selig and Rob Manfred. Rules have been altered for safety and competition—responses to events involving players like Babe Ruth, Jackie Robinson, and Pete Rose influenced regulations on conduct, equipment, and eligibility enforced in arbitration with figures such as Peter Seitz and institutions like the National Labor Relations Board. Recent amendments responded to analytic trends embodied by franchises like the Houston Astros and Oakland Athletics, and experimental formats tested during events at venues such as Coors Field and Tropicana Field.
Key definitions specify roles including the pitcher, catcher, first baseman, second baseman, third baseman, shortstop, and outfielders like the center fielder, and describe the home plate, pitcher's mound, baselines, foul lines, and warning track as standardized by MLB. Stadiums owned by entities such as Yankee Stadium, Fenway Park, and Wrigley Field vary within allowances for dimensions approved by the Commissioner's Office (MLB), with specific standards for mound height, base distance, and the infield grass cut used in venues like Dodger Stadium. Definitions include listed terms from the official rulebook such as force play, tag play, fair ball, foul ball, infield fly rule, balk, and designated hitter, and reference previous adaptations used in competitions such as the World Baseball Classic and the Olympic Games (baseball).
Gameplay rules prescribe nine-inning games, extra-inning procedures, the use of the designated hitter in interleague play and the World Series, substitution rules governing pinch hitters and defensive changes, and the structure of lineups submitted before games by managers like Joe Maddon and Tony La Russa. The official scoring system governs runs, innings, and the application of tie-breaking procedures used historically by franchises like the St. Louis Cardinals and decisions reviewed through instant replay processes instituted after proposals by committees including representatives from the Baseball Writers' Association of America and the Players Association (MLBPA). Game suspension, resumption, and forfeiture follow precedents set in notable contests at venues such as Comiskey Park and rulings involving teams like the Chicago Cubs.
Pitching rules cover delivery mechanics, balk enforcement, pitch count monitoring, and restrictions on foreign substances following investigations involving teams such as the Houston Astros and disciplinary actions by commissioners including Rob Manfred. Regulations define the strike zone, bat specifications, and bat certifications influenced by manufacturers and institutions like Rawlings and Louisville Slugger, and address defensive shifts, mound visits, and limits on pitcher warmups instituted in negotiations involving the Players Association (MLBPA). Historical pitching practices by figures like Cy Young and Sandy Koufax contextualize limits now codified to protect arms, while batting rules govern the construction and use of bats by players such as Barry Bonds and the testing protocols overseen by laboratory standards.
Fielding rules include force play, tag play specifics, the infield fly rule, and scoring principles applied to plays involving athletes like Derek Jeter and Robinson Cano. Baserunning protocols detail appeals, runner displacement, obstruction, and interference with guidance from past cases such as incidents involving Mookie Wilson and Bill Buckner, while scoring rules set criteria for earned runs, unearned runs, and pitcher decisions used in statistical records maintained by organizations like Statcast, Baseball-Reference, and the Society for American Baseball Research (SABR). Replay review procedures for safe/out calls and home run confirmations involve umpires from crews led historically by officials like Joe West.
Equipment rules regulate balls, bats, gloves, catcher's gear, helmets, and protective padding supplied by manufacturers such as Rawlings, Wilson Sporting Goods, and Easton, and require conformity to standards enforced at spring training facilities like those in Arizona and Florida. Uniform regulations address numbers, nameplates, logos, and protective gear worn by players from franchises including San Francisco Giants and Toronto Blue Jays, and include rules for advertising and commemorative patches approved by the Commissioner's Office (MLB) in coordination with sponsors and licensors.
Umpires appointed by the Umpires Association (MLB) enforce rules on the field, with discipline and appeals managed by the Commissioner's Office (MLB), the Players Association (MLBPA), and sometimes through arbitration panels including neutrals similar to those used by the National Labor Relations Board. Penalties include ejections, suspensions, fines, and forfeitures; high-profile enforcement actions have involved investigations into sign-stealing by teams such as the Houston Astros and conduct cases involving individuals like Pete Rose and Shoeless Joe Jackson. Enforcement mechanisms include replay review systems, postgame discipline, and collective bargaining outcomes negotiated during cycles involving representatives like Tony Clark.