Single-A, formerly known as Class 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. There are 30 teams classified at the Single-A level, one for each team in Major League Baseball (MLB), organized into three leagues: the California League, Carolina League, and Florida State League. [1]
Class A was originally the highest level of Minor League Baseball, beginning with the earliest classifications, established circa 1890. [2] : 15 Teams within leagues at this level had their players' contracts protected and the players were subject to reserve clauses. [2] : 15 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. [3] [4] [5] 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; Buffalo, New York; Worcester, Massachusetts; Omaha, Nebraska; Denver, Colorado; and Peoria, Illinois. [2] : 187 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 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 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 (or "Sally League"), with teams in communities such as Vancouver, British Columbia; Omaha, Nebraska; Colorado Springs, Colorado; Charlotte, North Carolina; Scranton, Pennsylvania; and Allentown, Pennsylvania. Class A soon included the Western League (1947–1958), Central League (1948–1951) and Western International League (1952–1954). The Western International League became the Class B Northwest League 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 designation was created, for teams playing June–September schedules, primarily meant for new players acquired via the amateur draft. The Class A-Advanced designation was established in 1990, between Class A and Double-A in the minor league hierarchy. [6] 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. [7] The overall hierarchy was:
Entering the 2020 minor league season (which was not played due to the COVID-19 pandemic), Class A consisted of the Midwest League and South Atlantic League (a newer "Sally League", which been formed in 1963 as the Western Carolinas League). 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. [8] The Midwest League and South Atlantic League were reclassified as "High-A" leagues, and operated during 2021 as High-A Central and High-A East, respectively. They were replaced at the Class A level by three "Low-A" leagues: [9] Low-A West, Low-A East, and Low-A Southeast. [10] These leagues had historically been known as the California League, Carolina League, and Florida State League, respectively, and had previously operated at the Class A-Advanced level. [8] 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. [11] MLB also discontinued use of "Low-A" in favor of Single-A. [11]
Florida State League
Carolina League
California League| Division | Team | MLB affiliation | City | Stadium | Capacity |
|---|---|---|---|---|---|
| North | Fresno Grizzlies | Colorado Rockies | Fresno, California | Chukchansi Park | 10,650 |
| Modesto Nuts | Seattle Mariners | Modesto, California | John Thurman Field | 4,000 | |
| San Jose Giants | San Francisco Giants | San Jose, California | Excite Ballpark | 4,200 | |
| Stockton Ports | Oakland Athletics | Stockton, California | Banner Island Ballpark | 5,300 | |
| South | Inland Empire 66ers | Los Angeles Angels | San Bernardino, California | San Manuel Stadium | 8,000 |
| Lake Elsinore Storm | San Diego Padres | Lake Elsinore, California | Lake Elsinore Diamond | 7,866 | |
| Rancho Cucamonga Quakes | Los Angeles Dodgers | Rancho Cucamonga, California | LoanMart Field | 6,200 | |
| Visalia Rawhide | Arizona Diamondbacks | Visalia, California | Valley Strong Ballpark | 2,468 |
 | This section needs expansionwith: playoff structure prior to the 2021 re-org. You can help by adding to it. (June 2021) |
On June 30, 2021, Minor League Baseball announced that the top two teams in each league (based on full-season winning percentage, and regardless of division) would meet in a best-of-five postseason series to determine league champions. [12]
The Southern League is a Minor League Baseball league that has operated in the Southern United States since 1964. Along with the Eastern League and Texas League, it is one of three circuits playing at the Double-A level, which is two grades below Major League Baseball (MLB).
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 until its demotion to Single-A following Major League Baseball's 2021 reorganization of the minor leagues. The league temporarily operated for the 2021 season as the Low-A East before reassuming its original moniker in 2022.
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 history, the league was promoted to High-A as part of Major League Baseball's 2021 reorganization of the minor leagues. The league temporarily operated for the 2021 season as the High-A East before reassuming its original moniker in 2022.
The Rome Emperors are a Minor League Baseball team of the South Atlantic League and the High-A affiliate of the Atlanta Braves. They are located in Rome, Georgia, and play their home games at AdventHealth Stadium. From 2003 to 2023, the team was known as the Rome Braves. They served as Atlanta's Class A affiliate before being elevated to High-A with the restructuring of the minor league system in 2021.
The Clearwater Threshers are a Minor League Baseball team of the Florida State League and the Single-A affiliate of the Philadelphia Phillies. They are located in Clearwater, Florida, and have played their home games at BayCare Ballpark since 2004. They previously played at Jack Russell Memorial Stadium from 1985 to 2003.
The Dunedin Blue Jays are a Minor League Baseball team of the Florida State League and are the Single-A affiliate of the Toronto Blue Jays Major League Baseball club. They are located in Dunedin, Florida, and play their home games at TD Ballpark, which opened in 1990 and seats 8,500 people.
The Myrtle Beach Pelicans are a Minor League Baseball team in Myrtle Beach, South Carolina, and the Single-A affiliate of the Chicago Cubs. The Pelicans compete in the Carolina League. Home games are played at Pelicans Ballpark, which opened in 1999 and seats up to 6,599 people.
The Salem Red Sox are a Minor League Baseball affiliate of the Boston Red Sox of Major League Baseball (MLB), based in Salem, an independent city adjacent to Roanoke, Virginia. The team competes at the Single-A level in the Carolina League. Home games are played at Carilion Clinic Field at Salem Memorial Ballpark, a 6,300-seat facility opened in 1995.
The Asheville Tourists is a Minor League Baseball team of the South Atlantic League and the High-A affiliate of the Houston Astros. It is located in Asheville, North Carolina.
Triple-A 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). There are 30 teams, one per each Major League Baseball (MLB) franchise, with 20 in the IL and 10 in the PCL. Triple-A teams are generally located in smaller cities who do not have major sports league teams such as Syracuse, Toledo, Reno and Omaha as well as larger metropolitan areas without MLB teams that may also have teams in other major sports leagues, such as Austin, Jacksonville, Columbus, Buffalo, and Indianapolis. Four Triple-A teams play in the same metro areas as their parent clubs.
Major League Baseball (MLB) is the highest level of baseball in the United States. The sport is one of the most popular sports in the U.S. for both participants and spectators.
Double-A 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 Baseball, organized into three leagues: the Eastern League, the Southern League, and the Texas League.
The Greenville Drive are a Minor League Baseball team based in Greenville, South Carolina. They are the High-A affiliate of the Boston Red Sox and are a member of the South Atlantic League. They play their home games at Fluor Field at the West End, and their mascot is a frog named Reedy Rip'it.
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 above Single-A. There are 30 teams classified at the High-A level, one for each team in Major League Baseball (MLB), organized into three leagues: the Midwest League, Northwest League, and South Atlantic League.
Andrew James Garcia is an American former professional baseball second baseman. Prior to beginning his professional career, he played college baseball at the University of California, Riverside. Garcia has also competed for the United States national baseball team.
Class A Short Season 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, and Class A. Teams in Class A Short Season played about 75 to 80 games per season, compared to the 130- to 140-game seasons of most professional baseball minor leagues.
Minor League Baseball (MiLB) is a professional baseball organization below Major League Baseball (MLB), including teams affiliated with MLB clubs.
Tyler Bram Krieger is an American former professional baseball second baseman and outfielder.
