MLB
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| MLB | |
|---|---|
 Major League Baseball · Public domain · source | |
| Name | Major League Baseball |
| Founded | 1869 (professional origins); 1903 (modern era) |
| Commissioner | Rob Manfred |
| Teams | 30 |
| Country | United States and Canada |
| Headquarters | New York City |
MLB is the highest level of professional baseball in the United States and Canada, comprising thirty teams split between the American League and the National League. It determines annual champions through a postseason culminating in the World Series and oversees rules, player transactions, and labor relations with the Major League Baseball Players Association. MLB traces institutional continuity from nineteenth-century professional clubs to the modern franchise era and has been central to the professionalization and commercialization of sports in North America.
History
The professionalization of baseball began with clubs such as the Cincinnati Red Stockings and organizations like the National Association of Base Ball Players, leading to the formation of the National League in 1876 and the American League under figures including Ban Johnson in 1901. The modern structure dates from the 1903 agreement between the two leagues and the establishment of the World Series between the champions of each league. Pivotal historical events include the Black Sox Scandal (1919), the integration led by Jackie Robinson joining the Brooklyn Dodgers in 1947, expansion eras that added franchises like the New York Mets and Toronto Blue Jays, and labor conflicts culminating in the 1994–95 Major League Baseball strike. Rules changes and business innovations—such as the introduction of the Designated Hitter, free agency after the Flood v. Kuhn era, and revenue-sharing models—shaped competitive balance and franchise economics, while landmark ballparks like Fenway Park and Wrigley Field became cultural icons.
Organization and Governance
Governance centers on the Commissioner of Baseball, who enforces rules, discipline, and collective bargaining agreements with the Major League Baseball Players Association; notable commissioners include Kenesaw Mountain Landis, Bowie Kuhn, and Bud Selig. Ownership groups range from single-family owners like the Steinbrenner family of the New York Yankees to corporate and consortium ownerships such as those of the Los Angeles Dodgers and Chicago Cubs. The league office administers operations including scheduling, umpiring via the Major League Baseball Umpires Association era, the draft governed by the Rule 4 draft framework, and player movement mechanisms including free agency and the waiver process. Antitrust considerations have involved litigation like Toolson v. New York Yankees and legislative attention resulting in the unique antitrust exemption doctrine.
Teams and Ballparks
Thirty franchises operate in metropolitan markets from New York City and Los Angeles to Toronto and Seattle, with divisions: AL East, AL Central, AL West, NL East, NL Central, and NL West. Iconic venues include Yankee Stadium, Fenway Park, Wrigley Field, Dodger Stadium, and newer parks such as Oracle Park and Truist Park. Teams maintain farm systems through affiliations with Minor League Baseball clubs like the Rochester Red Wings and Durham Bulls, and player development pathways involve international academies in countries including the Dominican Republic, Venezuela, and Cuba. Relocation and expansion have included moves like the Montreal Expos relocation to Washington, D.C. (becoming the Washington Nationals) and expansion franchises such as the Tampa Bay Rays and Arizona Diamondbacks.
Season Structure and Competitions
The annual calendar includes a spring training period in Arizona and Florida's Grapefruit League and Cactus League, a 162-game regular season, followed by postseason tournaments leading to the World Series. The postseason format has varied, incorporating the Division Series, Championship Series, and wild-card play-in games that expanded in 2012 and again in 2022. Interleague play between American League and National League clubs became regular in 1997, altering scheduling and rivalry dynamics, while international events like the World Baseball Classic and exhibition tours promote global reach. Awards recognizing seasonal achievement include the Most Valuable Player Award, Cy Young Award, Rookie of the Year Award, and the Manager of the Year Award.
Rules and Gameplay
On-field regulation follows a codified ruleset historically published in the Official Baseball Rules, covering aspects like the pitcher-batter duel, base running, fielding, and substitution. The adoption of the Designated Hitter in the American League (and later universal DH implementation) changed roster construction, while technological integrations such as the automatic strike zone experiments and expanded replay review for umpires have altered adjudication. The baseball itself, mound distance, and ballpark dimensions influence play styles exemplified by power hitters like Babe Ruth and contact hitters like Tony Gwynn. Competitive strategies involve analytics pioneered by figures associated with Moneyball and organizations such as the Oakland Athletics and Los Angeles Dodgers.
Notable Players and Records
Historical legends include Babe Ruth, Ty Cobb, Hank Aaron, Willie Mays, Ted Williams, Lou Gehrig, and Mickey Mantle; modern icons include Barry Bonds, Derek Jeter, Albert Pujols, Mike Trout, and Ken Griffey Jr.. Single-season and career records encompass achievements like Babe Ruth's home run seasons, Pete Rose's all-time hits, Nolan Ryan's strikeouts, and Cy Young's wins record. Milestones such as 3,000 hits, 500 home runs, and pitching feats including perfect games by Don Larsen and Randy Johnson are benchmarks of excellence. Hall of Fame induction at the National Baseball Hall of Fame and Museum in Cooperstown, New York remains the sport's highest individual honor amid debates over eligibility tied to issues like performance-enhancing drugs exemplified by cases involving Mark McGwire and Sammy Sosa.
Cultural Impact and Media Coverage
Baseball has influenced American and Canadian popular culture through literature like The Natural and films including Field of Dreams, television broadcasts from networks like ESPN and Fox Sports, and radio traditions featuring commentators such as Vin Scully. Broadcast innovations include the rise of cable networks, regional sports networks like SportsNet New York and MASN, and streaming deals altering rights distribution. Internationalization efforts intersect with diplomacy and migration, seen in player migration from Japan via the posting system and exhibitions in Japan and Mexico. Social and political intersections include civil rights milestones tied to Jackie Robinson and labor movements represented by the Major League Baseball Players Association's collective bargaining, while stadiums and fan culture sustain local identities through rivalries like Yankees–Red Sox rivalry and events like the All-Star Game.