Class A, also known as Single-A and sometimes as Low-A, is the fourth-highest level of play in
Minor League Baseball in the United States, below
Triple-A,
Double-A, and
High-A
High-A (officially Class High-A, formerly known as Class A-Advanced, and sometimes abbreviated "A+" in writing) is the third-highest level of play in Minor League Baseball in the United States and Canada, below Triple-A and Double-A, and abov ...
. There are 30 teams classified at the Single-A level, one for each team in
Major League Baseball
Major League Baseball (MLB) is a professional baseball organization and the oldest major professional sports league in the world. MLB is composed of 30 total teams, divided equally between the National League (NL) and the American League (AL), ...
(MLB), organized into three leagues: the
California League
The California League is a Minor League Baseball league that operates in California. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following Major Leag ...
,
Carolina League
The Carolina League is a Minor League Baseball league which has operated along the Atlantic Coast of the United States since 1945. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 unti ...
, and
Florida State League
The Florida State League (FSL) is a Minor League Baseball league based in the state of Florida. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following ...
.
History
Class A was originally the highest level of
Minor League Baseball, beginning with the earliest classifications, established circa 1890.
[ Teams within leagues at this level had their players' contracts protected and the players were subject to ]reserve clause
The reserve clause, in North American professional sports, was part of a player contract which stated that the rights to players were retained by the team upon the contract's expiration. Players under these contracts were not free to enter into ano ...
s. When the National Association of Professional Baseball Leagues – the formal name of Minor League Baseball – was founded in 1901, Class A remained the highest level, restricted to leagues with cities that had an aggregate population of over a million people. Entering the 1902 season, the only Class A leagues were the Eastern League and the Western League—both leagues had eight teams, in cities such as Toronto, Ontario
Toronto ( ; or ) is the capital city of the Canadian province of Ontario. With a recorded population of 2,794,356 in 2021, it is the most populous city in Canada and the fourth most populous city in North America. The city is the ancho ...
; Buffalo, New York
Buffalo is the second-largest city in the U.S. state of New York (behind only New York City) and the seat of Erie County. It is at the eastern end of Lake Erie, at the head of the Niagara River, and is across the Canadian border from South ...
; Worcester, Massachusetts
Worcester ( , ) is a city and county seat of Worcester County, Massachusetts, United States. Named after Worcester, England, the city's population was 206,518 at the 2020 United States census, 2020 census, making it the second-List of cities i ...
; Omaha, Nebraska
Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River. The nation's 39th-largest cit ...
; Denver, Colorado
Denver () is a consolidated city and county, the capital, and most populous city of the U.S. state of Colorado. Its population was 715,522 at the 2020 census, a 19.22% increase since 2010. It is the 19th-most populous city in the Unit ...
; and Peoria, Illinois
Peoria ( ) is the county seat of Peoria County, Illinois, United States, and the largest city on the Illinois River. As of the United States Census, 2020, 2020 census, the city had a population of 113,150. It is the principal city of the Peoria ...
.[ Leagues operating within less populated areas were classified as Class B, Class C, or Class D.
Class A remained the top classification until ]Class AA
Double-A (officially Class AA) is the second-highest level of play in Minor League Baseball in the United States since 1946, below only Triple-A. There are currently 30 teams classified at the Double-A level, one for each team in Major League ...
was established in 1912, then remained the second-highest classification until Class A1 was established in 1936. In 1946, the top two levels changed from being Class AA and Class A1 to being Class AAA
Triple-A (officially Class AAA) has been the highest level of play in Minor League Baseball in the United States since 1946. Currently, two leagues operate at the Triple-A level, the International League (IL) and the Pacific Coast League (PCL ...
and AA, with Class A remaining the third-highest level, above Classes B through D. Class A in 1946 consisted of the Eastern League and the original South Atlantic League
The South Atlantic League, often informally called the Sally League, is a Minor League Baseball league with teams predominantly in states along the Atlantic coast of the United States from New York to Georgia. A Class A league for most of its ...
(or "Sally League"), with teams in communities such as Vancouver, British Columbia
Vancouver ( ) is a major city in western Canada, located in the Lower Mainland region of British Columbia. As the List of cities in British Columbia, most populous city in the province, the 2021 Canadian census recorded 662,248 people in the ...
; Omaha, Nebraska
Omaha ( ) is the largest city in the U.S. state of Nebraska and the county seat of Douglas County. Omaha is in the Midwestern United States on the Missouri River, about north of the mouth of the Platte River. The nation's 39th-largest cit ...
; Colorado Springs, Colorado
Colorado Springs is a home rule municipality in, and the county seat of, El Paso County, Colorado, United States. It is the largest city in El Paso County, with a population of 478,961 at the 2020 United States Census, a 15.02% increase since ...
; Charlotte, North Carolina
Charlotte ( ) is the most populous city in the U.S. state of North Carolina. Located in the Piedmont region, it is the county seat of Mecklenburg County. The population was 874,579 at the 2020 census, making Charlotte the 16th-most populo ...
; Scranton, Pennsylvania
Scranton is a city in the Commonwealth (U.S. state), Commonwealth of Pennsylvania, United States, and the county seat of Lackawanna County, Pennsylvania, Lackawanna County. With a population of 76,328 as of the 2020 United States census, 2020 U ...
; and Allentown, Pennsylvania
Allentown (Pennsylvania Dutch language, Pennsylvania Dutch: ''Allenschteddel'', ''Allenschtadt'', or ''Ellsdaun'') is a city in Lehigh County, Pennsylvania, Lehigh County, Pennsylvania. The city has a population of 125,845 as of the 2020 United ...
. Class A soon included the Western League (1947–1958), Central League
The or is one of the two professional baseball leagues that constitute Nippon Professional Baseball in Japan. The winner of the league championship plays against the winner of the Pacific League in the annual Japan Series. It currently consist ...
(1948–1951) and Western International League
The Western International League was a mid- to higher-level minor league baseball circuit in the Pacific Northwest United States and western Canada that operated in 1922, 1937 to 1942 and 1946 to 1954. In 1955, the Western International League ev ...
(1952–1954). The Western International League became the Class B Northwest League
The Northwest League is a Minor League Baseball league that operates in the Pacific Northwest, Northwestern United States and Western Canada. A Class A Short Season league for most of its history, the league was promoted to High-A as part of Maj ...
in 1955, and the Western and Central loops folded.
The hierarchy of Triple-A through Class D continued until Minor League Baseball restructured in 1963, at which time Classes B through D were abolished, with existing leagues at those levels reassigned into Class A, while the South Atlantic League (renamed as the Southern League) and Eastern League ascended to Double-A.
In 1965, a Class A Short Season
Class A Short Season (officially Short-Season A) was a level of play in Minor League Baseball in the United States from 1965 through 2020. In the hierarchy of minor league classifications, it was below Triple-A, Double-A, Class A-Advanced (cre ...
designation was created, for teams playing June–September schedules, primarily meant for new players acquired via the amateur draft. The Class A-Advanced
High-A (officially Class High-A, formerly known as Class A-Advanced, and sometimes abbreviated "A+" in writing) is the third-highest level of play in Minor League Baseball in the United States and Canada, below Triple-A and Double-A, and abov ...
designation was established in 1990, between Class A and Double-A in the minor league hierarchy. Class A and Class A Short Season were considered independent classifications, with Class A having "Full-Season" and Advanced sub-classifications, per the rules governing baseball's minor leagues. The overall hierarchy was:
# Triple-A
# Double-A
# Class A-Advanced
# Class A ("Full-Season A")
# Class A Short Season ("Short-Season A")
# Rookie league
Entering the 2020 minor league season (which was not played, due to the COVID-19 pandemic
The COVID-19 pandemic, also known as the coronavirus pandemic, is an ongoing global pandemic of coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The novel virus was first identif ...
), Class A consisted of the Midwest League
The Midwest League is a Minor League Baseball league established in 1947 and based in the Midwestern United States. A Class A league for most of its history, the league was promoted to High-A as part of Major League Baseball's 2021 reorganizat ...
and South Atlantic League
The South Atlantic League, often informally called the Sally League, is a Minor League Baseball league with teams predominantly in states along the Atlantic coast of the United States from New York to Georgia. A Class A league for most of its ...
(a newer "Sally League", which been formed in 1963 as the Western Carolinas League
Portion of plaque displaying likeness of John Henry Moss at Municipal Stadium, Hagerstown, Maryland
The Western Carolinas League was a Class D (1948–52; 1960–62) and a low Class A (1963–79) full-season league in American minor league base ...
). Prior to the 2021 season, MLB restructured the minor leagues, eliminating Class A Short Season and discontinuing the use of all historical league names within Minor League Baseball.[ The Midwest League and South Atlantic League were reclassified as "High-A" leagues, and operated during 2021 as ]High-A Central
The Midwest League is a Minor League Baseball league established in 1947 and based in the Midwestern United States. A Class A league for most of its history, the league was promoted to High-A as part of Major League Baseball's 2021 reorganizat ...
and High-A East
The South Atlantic League, often informally called the Sally League, is a Minor League Baseball league with teams predominantly in states along the Atlantic coast of the United States from New York to Georgia. A Class A league for most of its h ...
, respectively. They were replaced at the Class A level by three "Low-A" leagues: Low-A West
The California League is a Minor League Baseball league that operates in California. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following Major Leag ...
, Low-A East
The Carolina League is a Minor League Baseball league which has operated along the Atlantic Coast of the United States since 1945. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 unt ...
, and Low-A Southeast
The Florida State League (FSL) is a Minor League Baseball league based in the state of Florida. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following ...
. These leagues had historically been known as the California League
The California League is a Minor League Baseball league that operates in California. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following Major Leag ...
, Carolina League
The Carolina League is a Minor League Baseball league which has operated along the Atlantic Coast of the United States since 1945. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 unti ...
, and Florida State League
The Florida State League (FSL) is a Minor League Baseball league based in the state of Florida. Having been classified at various levels throughout its existence, it operated at Class A-Advanced from 1990 until its demotion to Single-A following ...
, respectively, and had previously operated at the Class A-Advanced level. These three leagues operated with Low-A naming for the 2021 season. Following MLB's acquisition of the rights to the names of the historical minor leagues, MLB announced on March 16, 2022, that the leagues would revert to their prior names, effective with the 2022 season. MLB also discontinued use of "Low-A" in favor of Single-A.[
]
Current teams
Florida State League
Carolina League
California League
Playoffs
On June 30, 2021, Minor League Baseball announced that the top two teams in each league (based on full-season winning percentage
In sports, a winning percentage is the fraction of games or matches a team or individual has won. The statistic is commonly used in standings or rankings to compare teams or individuals. It is defined as wins divided by the total number of match ...
, and regardless of division) would meet in a best-of-five postseason series to determine league champions.
References
External links
*
{{California League
Minor league baseball
Carolina League
Florida State League
California League