Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. As of 2022, a total of 30 teams play in Major League Baseball—15 teams in the National League (NL) and 15 in the American League (AL)—with 29 in the United States and 1 in Canada. The NL and AL were formed in 1876 and 1901, respectively. Beginning in 1903, the two leagues signed the National Agreement and cooperated but remained legally separate entities until 2000, when they merged into a single organization led by the Commissioner of Baseball. MLB is headquartered in Midtown Manhattan.
Nippon Professional Baseball or NPB is the highest level of baseball in Japan. Locally, it is often called Puro Yakyū (プロ野球), meaning Professional Baseball.
This list consists of players who have appeared in Major League Baseball. Note that the list also includes players who appeared in the National Association of Professional Base Ball Players, which is not universally considered a major league.
In baseball or softball, a strikeout occurs when a batter accrues three strikes during a time at bat. It usually means the batter is out. A strikeout is a statistic recorded for both pitchers and batters, and is denoted by K in scorekeeping and statistics. A "strikeout looking" — in which the batter does not swing and the third strike is called by the umpire — is usually denoted by a ꓘ.
Charles Herbert Klein, nicknamed the "Hoosier Hammer", was an American professional baseball outfielder. Klein played in Major League Baseball (MLB) for the Philadelphia Phillies, Chicago Cubs (1934–1936), and Pittsburgh Pirates (1939).
William Jethro "Kid" Gleason was an American Major League Baseball (MLB) player and manager. Gleason managed the Chicago White Sox from 1919 through 1923. His first season as a big league manager was notable for his team's appearance in the World Series and the ensuing Black Sox Scandal, although Gleason was not involved in the scandal. After leaving the White Sox, Gleason was on the coaching staff for the Philadelphia Athletics, until 1931.
A Major League Baseball roster is a list of players who are allowed, by league agreement, to play for a Major League Baseball (MLB) team. Each MLB team maintains two rosters: an active roster of players eligible to participate in an MLB game, and an expanded roster encompassing the active roster plus additional reserve players.
Major League Baseball transactions are changes made to the roster of a major league team during or after the season. They may include waiving, releasing, and trading players, as well as assigning players to minor league teams.
Designated for assignment (DFA) is a contractual term used in Major League Baseball (MLB). A player who is designated for assignment is immediately removed from the team's 40-man roster, after which the team must, within seven days of the date of designation, return the player to the 40-man roster, place the player on waivers, trade the player, release the player, or outright the player from the 40-man roster into Minor League Baseball.
Minor League Baseball (MiLB) is a hierarchy of professional baseball minor leagues in the Americas that compete at skill levels below Major League Baseball (MLB) and help prepare players to join major league teams. Those teams which are affiliated with MLB teams operate under the Commissioner of Baseball within the scope of organized baseball. Several leagues, known as independent baseball leagues, consist of teams with no affiliation to MLB teams.