Closer (baseball)
Overview
A closer (Korean: 마무리 투수) is a specialized relief pitcher in baseball who takes the mound in the final inning of a game in which the team is leading, usually the ninth inning, to protect the win. He is at the final stage of the bullpen, and if he enters and preserves the lead, he records a 'save.' Because the position directly determines the outcome of the game, it demands strong stuff, mental durability, and above all the consistency not to repeat failures.
Main Content
Definition and history
The concept of the 'closer' took hold as relief pitcher usage became more sophisticated in Major League Baseball in the 1970s and 1980s. Rollie Fingers, Goose Gossage, and Dennis Eckersley are representative figures from the early settling period, and after the 1990s the role of dedicated ninth-inning pitcher became common. In Korean professional baseball (KBO), since the 1990s Won Jong-sam, Sun Dong-yol, and later Koo Dae-sung and Oh Seung-hwan firmly established the concept of the closer. Currently, the formula that 'the ninth inning unconditionally belongs to the closer' is gradually being shaken along with data analysis, but most teams still operate a dedicated closer system.
Conditions for entering
Official save requirements are as follows. (1) When he enters with the team leading and finishes the game to the end. (2) When he pitches at least one inning with a lead of three runs or fewer. (3) When he enters with runners on base and protects a lead equal to the number of runners left on base, including the potential tying run. (4) When he pitches at least three innings and protects the lead. If he enters in a situation that does not meet these conditions and protects the lead, it is recorded as a 'hold.' Conversely, if he fails to protect the lead and allows a tie or a comeback, it becomes a 'blown save.'
Qualities required of a closer
The most important qualities for a closer are strikeout ability and walk suppression. In the ninth inning, a runner reaching base directly leads to runs, so a pitcher must have the stuff to record outs himself without relying on the defense. Pitchers with a fastball averaging 150 km/h or more and a put-away pitch (slider, forkball, changeup, etc.) are preferred; stamina management to throw short innings at full effort and recovery ability to pitch every day are also important. Psychological factors are also significant. The 'mental toughness' to not waver after allowing a run and to get the next batter is cited as a core quality of a closer.
Pitching styles and types
Closers are broadly divided into two types. The first is the 'power type,' who records strikeouts with overwhelming stuff, represented by Oh Seung-hwan, Brad Lidge, and Aroldis Chapman. The second is the 'finesse type,' who disrupts batters' timing with precise control and a variety of pitches, including Mariano Rivera and Trevor Hoffman. Recently, pitchers who combine both types are considered ideal.
Representative closers
The all-time MLB save leader is Mariano Rivera (652 saves), followed by Trevor Hoffman, Lee Smith, and Francisco Rodríguez. In the KBO League, Oh Seung-hwan holds the all-time save record, and Son Seung-lak, Jung Woo-ram, and Lim Chang-yong are counted among representative closers. In Nippon Professional Baseball, Kazuhiro Sasaki and Kyuji Fujikawa left their names.
Injuries and management
Because closers pitch at maximum velocity every game, they are at high risk of elbow and shoulder injuries. Indeed, many closers undergo Tommy John surgery, and clubs manage the interval between appearances and pitch counts. Recently, usage aimed at injury prevention, such as avoiding consecutive appearances and prohibiting three straight appearances, has spread.
Recent trends
In 2024-2025, closer usage is changing rapidly under the influence of data analysis. First, the 'fixed ninth inning' system has weakened, and an 'optimal matchup' strategy of using the best reliever in the key section of the opposing lineup has spread. Second, the trend of evaluating the save statistic itself as less valuable and emphasizing WPA (win probability added) or leverage index has strengthened. Third, as a system for developing 'bullpen aces' who maximize velocity and spin rate has taken hold, cases of converting rookie pitchers into closers early have increased. In the KBO as well, young closers are increasing, and restrictions on three consecutive appearances and appearance-management guidelines are being discussed at the league level. Also, in MLB, the pitch clock and pickoff restrictions introduced in 2023 have led to an increase in stolen base attempts, making a closer's quick motion and pickoff ability emerge as new evaluation factors.
Related topics
- [[Relief pitcher]]
- [[Save (baseball)]]
- [[Blown save]]
- [[Setup man]]
- [[Bullpen]]
- [[Oh Seung-hwan]]
- [[Mariano Rivera]]
- [[KBO League]]