Major League Baseball rosters
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A Major League Baseball roster is a roster of players allowed by league agreement to play for their respective Major League team. There are two types of rosters in general, the "active roster" of 25 players and the "expanded roster" of 40 players.
Since 1910, when teams were first allowed to carry players under contract in excess of those allowed to participate in regular season games, the latter has been called the "active roster." With exceptions through the years for varying economic conditions (primarily during World War I, the Great Depression, post-World War II and from 1986-1989 when the limit was made 24 because of rising player salaries), the active roster has allowed up to 25 players to participate for a Major League team within specified dates, currently Opening Day to September 1. In 1968 the 25-player maximum for active rosters was made a part of the first collective bargaining agreement between the major leagues and the Major League Baseball Players Association. Since 1977 teams have been required to carry a minimum of 24 players on their active rosters as well.
Active rosters include the starting eight (AL) or nine (NL) position players, pitchers, and reserve players on the team. Players on the active roster are also on the 40-man roster. These players are generally the only ones who dress in uniform and are the only ones who may take the field in a game at any time. Typically, only players on the active roster, and players who are on the disabled list but and are on the active roster on the 15 day DL or players off the 40 man roster on the 60 day-DL travel on road trips with the Major League team.
Typically, in modern-day play, an active roster will consist of five starting pitchers, seven relief pitchers, two catchers, six infielders, and five outfielders. Teams can vary this somewhat according to preference and circumstance, and indeed the "typical" roster makeup has changed somewhat over the years. (Starting rotations used to consist of four pitchers, not five, well into the 1970s; third-string catchers used to be much more common; many other minor variations exist.) In the American League, a full-time designated hitter is usually classified as either an infielder or an outfielder, not a DH, because most DHs do play defensive positions from time to time.
Since the 2012 season, teams have been allowed 26-player active rosters for "day-night" doubleheaders—two games scheduled on the same day, but with the stadium cleared between games, and separate tickets sold for each game—as long as the doubleheaders have been scheduled with at least 48 hours notice.
Also called the "40-man roster", the expanded roster is composed of all the players in a Major League club's organization who are signed to a major-league contract. The 40-man roster limit has been in effect since 1921, except for 1945-1946 when it was raised to 48 to accommodate veterans returning from military service in World War II, and from 1962 to 1965 when it was raised to 41 to add a reserve spot for first-year players acquired before implementation of a player draft was approved prior to the 1965 season.
The expanded roster includes all players who are eligible for call-up to the active roster at any given time. Also on the 40-man are any players on the 10-day disabled list and minor league players who are signed to a major-league contract but are on an "optional assignment" to the minors. (Each player has three "option years" to be sent to the minors once on the expanded roster before they must be placed on waivers to be sent there.) Players who were on the 40-man but are placed on the 60-day disabled list are taken off the 40-man until the time on the DL is over. The same applies to players who are suspended. Because players on the 60-day DL are taken off the 40-man with no risk of losing the player, MLB teams often transfer injured players from the 15-day DL to the 60-day DL so that they can add another player to the 40-man without having to designate a player for assignment. Designating for assignment ("DFA") is the removal of a player from the expanded roster, whereby the team has 10 days to trade the player, release him, or send him to the minors.
On September 1, the Major League team's roster expands from the 25-man active roster to the entire 40-man roster. At this point, any player on the expanded roster on August 31 may play for the Major League team.
September call-ups are players from the minors who are playing in September to get Major League experience and, especially for teams in contention, to provide reinforcements down the stretch. Note, however, that once the roster expands, in practice teams will utilize a number of September call-ups (typically up to half-a-dozen), but seldom if ever the full 15 extra players that the rules allow.
A postseason roster takes effect only if a team clinches a playoff berth. Players who are part of the team's final roster at the end of the regular season are eligible to participate in the postseason. Any player who has been traded from a different team spent time in the Minor Leagues, or signed later in the season with the team (no later than August 31) is eligible to participate in the postseason. A postseason roster is allowed up to 25 active players. Other players who are not on the 25-man active roster will be assigned to the postseason secondary squad. Players who are on the disabled list or any other non-active transaction by the end of the regular season will have their transactions passed on in the postseason. Rosters for a series are set at the beginning of the series and no changes to the 25-man active roster are allowed except when a player is moved to the disabled list or any other inactive transaction. If a player is moved to the disabled list or another inactive transaction during a series, he then becomes ineligible to be returned to the 25-man active roster for the remainder of the series as well as the next series if applicable. If any player goes on any inactive transaction, any player from the 40-man roster can be promoted to the 25-man active roster for the remainder of the series if applicable.
For a player to be eligible for the postseason active roster, he must have either been on his club's expanded roster or disabled list as of midnight ET on August 31 of that year and not placed on the 60 day disabled list after August 1. The one exception is for replacing players on the disabled list. Since the 2014 season, an injured player eligible for postseason play may be replaced by any player within his club's organization, including players assigned to the club's minor league affiliates who are not on the major league 40-man roster. Prior to 2014, only players who were on a club's 40-man roster (including those added to the expanded roster after August 31 who would not otherwise be eligible for the postseason) at the conclusion of the regular season were eligible to replace injured players on postseason rosters. The 2015 Kansas City Royals were the first club to exploit this new provision when they added Raúl A. Mondesí—who at the time was assigned to the Royals' Double-A affiliate and was not on the 40-man roster—to their World Series roster.
All other professional players affiliated with Major League Baseball are signed to minor-league contracts. They can receive an invitation to spring training with their organization's Major League team without being on the 40-man roster. Two types of players generally receive a non-roster invitation: prospect players who are there to gain experience and face tougher competition as well as receive instruction from the Major League team's coaching staff; and veteran players who were not offered any major league contract by a club. The veteran player is usually signed to a "two-way" salary option—one for their time in the minors and another if they are placed on the 40-man during the season. All spring training invitees are under some sort of contract, to avoid liability if an injury were to occur to the player.
Since 1933, an annual Major League Baseball All-Star Game referred to as the "Midsummer Classic", has been played (except 1945) during the "All-Star break" at the middle of each baseball season. The game features an American League (AL) All-Star team versus a National League (NL) All-Star team.