Free agency inMajor League Baseball (MLB) concernsprofessional athletes whose contracts with a team have expired and who are therefore eligible to sign with another team. Specifics are governed by acollective bargaining agreement (CBA) between MLB and its players'labor union, theMajor League Baseball Players Association (MLBPA). Before the mid-1970s, professional baseball players could effectively be bound, in perpetuity, to the team holding their contract via a "reserve clause", thus preventing them from becoming free agents.

Free agency was very limited for most of the first century oforganized baseball. Through the use of areserve clause in player contracts, first instituted by theNational League in 1879, the contractual rights to a player could be retained by a team even after the expiration of the player's contract.[1] As long as the team renewed his contract annually (which the team could do unilaterally), the player had no ability to enter into a contract with a different team.[1] The team with a player's contract rights could reassign, trade, or sell the player at will.[1] A player would only become a free agent if he was released by his team,[2] or if his team did not renew his contract.[3] By preventing players from voluntarily moving between teams, the reserve clause kept salaries low; team owners claimed it prevented wealthy teams from hoarding the best players and ruining the competitive balance of baseball.[1]
The reserve clause, along with baseball's exemption from theSherman Antitrust Act (an exemption dating to the 1922Supreme Court caseFederal Baseball Club v. National League),[4] was upheld in the 1953 Supreme Court caseToolson v. New York Yankees, Inc.[5]
A notable challenge to the reserve clause was the 1972 Supreme Court caseFlood v. Kuhn, with the plaintiff being outfielderCurt Flood and the defendant beingBowie Kuhn, theCommissioner of Baseball; the Supreme Court ruled against Flood.[6][7]
In December 1974, pitcherCatfish Hunter won an arbitration hearing against theOakland A's, initiated by abreach of contract dispute, making Hunter a free agent.[8][9] Hunter subsequently signed a multi-million dollar contract with theNew York Yankees.[10] For his role in demonstrating what a highly sought-after player could be worth on the open market,[11] Hunter has been "credited with ushering in the free-agent era."[12]
In December 1975, an arbitration case betweenMajor League Baseball (MLB) and theMajor League Baseball Players Association (MLBPA) that challenged the reserve clause was decided in favor of two players,Andy Messersmith andDave McNally.[13] Known as theSeitz decision, it effectively ended the reserve clause in baseball: a player became a free agent after playing one season without signing a contract (the contract having been unilaterally renewed by the team); teams had previously been able to renew unsigned contracts annually, for as long as they wished to do so.[13]
The specific language of the reserve clause, as quoted in the Supreme Court decision forFlood v. Kuhn, was:[6]
10. (a) On or before January 15 (or if a Sunday, then the next preceding business day) of the year next following the last playing season covered by this contract, the Club may tender to the Player a contract for the term of that year by mailing the same to the Player at his address following his signature hereto, or if none be given, then at his last address of record with the Club. If prior to the March 1 next succeeding said January 15, the Player and the Club have not agreed upon the terms of such contract, then on or before 10 days after said March 1, the Club shall have the right by written notice to the Player at said address to renew this contract for the period of one year on the same terms, except that the amount payable to the Player shall be such as the club shall fix in said notice; provided, however, that said amount, if fixed by Major League Club, shall be an amount payable at a rate not less than 80% of the rate stipulated for the preceding year.
Since the end of the reserve clause via the Seitz decision, changes to major-league free agency have been made throughcollective bargaining agreements (CBAs), as negotiated between MLB and the MLBPA.

The agreement signed on July 12, 1976, allowed players to become free agents after playing in the major leagues for six years—such players could then negotiate with up to 12 clubs (in reverse order of the prior season's final standings)—and players could demand a trade after playing in the major leagues for five years—if not traded, the player became a free agent.[15][16] The agreement was ratified by a vote of players in early August.[17]
As part of the settlement of the1981 MLB strike, the league and players agreed to a classification system for free agents.[18] Free agents were classified as either Type A, Type B, or unclassified:[18]
Teams that lost a Type A free agent to whom they had offered arbitration received the top selection in the annualamateur draft from the team that signed the free agent, plus a supplemental selection in the upcoming draft as compensation. Teams losing Type B free agents to whom they had offered arbitration received only a supplemental pick as compensation. Teams that lost unclassified free agents, or who did not offer arbitration to classified free agents, did not receive any compensation.[19]
The collective bargaining agreement signed on November 22, 2011, which took effect with the2012 season, dramatically changed free agent compensation. Players were no longer classified by type; if a player has six or more years of major-league service (on the team's40-man roster) and is not under contract for the following season, he is automatically a free agent. The team can offer him an arbitration salary if they want to be able to receive draft pick compensation,[20] and such an offer must be at least the average of the 125 richest contracts.[21] However, if a player is traded during the final season of his contract, his new team will be ineligible to receive any draft pick compensation.[22]
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If a player is drafted and is offered a contract by his drafting team (or any team to which he is traded) each year, he may not become a free agent until:
Two examples of players falling under (2) above areHideki Okajima andHiroki Kuroda.
A player with fewer than six years of service time is eligible for salary arbitration if he:
Players with more than six years of service time and who are eligible for free agency can also be offered arbitration when their contracts are up, if they have been tendered a contract offer by their current team by the tender deadline, and have not agreed on a contract.[23][24]
The 4.2 example of arbitration eligibility above is called the "Super Two" exception, in which a player will have an extra year of arbitration eligibility.[25][26] Notable "Super Two" players includeNolan Arenado,Chris Archer,Anthony Rendon, andAvisail Garcia.[27]Following the salary arbitration process, the player and the team both submit a salary offer for a new contract. The arbitrator chooses one number or the other, based on which offer is closest to the salaries of players with similar ability and service time.
For purposes of salary arbitration and free agency, a player acquires a year of service time if the player remains on the major league roster for at least 172 days of the typical 187-day season.
Players eligible for neither free agency nor salary arbitration are very seldom offered contracts for much more than the league minimum salary, as the player has no recourse to try to obtain a better salary elsewhere. For this reason, in the first three major league years of their careers (except for the "Super Two" exception above), it is standard practice for players to accept comparatively low salaries even when their performance is stellar.[citation needed] Occasionally, a team may wish to sign a player in his second or third year to a long-term contract, and the resulting negotiations can involve salaries significantly higher than minimum. A recent example is the contractRyan Braun signed barely a year into his major league career, which would have taken him through 2015.[28] However, in April 2011, he and theMilwaukee Brewers extended that contract through 2020.[29][original research?]
A team does not have to offer a contract to a player not eligible for free agency if his contract has expired, regardless of service time. If the player is not tendered a contract offer by the tender deadline (usually in the second week of December), the player becomes a non-tender free agent.
If a player becomes a free agent without accruing six years of service time and is not a 10-year NPB free agent, they will still be subject to service time rules with their new club. For this reason, these free agents are typically only signed to a one-year contract as nothing further is required to maintain team control if the player will have less than six years’ service time at the end of that year. For example,Derek Dietrich became a free agent after being designated for assignment by theMiami Marlins and elected to become a free agent instead. He was signed by theCincinnati Reds for the2019 season on a minor league deal. The Reds selected his contract for the 2019 season and he had accrued five years of service time at the beginning of the 2020 season. He was under the Reds’ team control and was eligible for arbitration as if he had remained with a single team. Dietrich became a free agent in 2021.[citation needed]