In baseball, a left-handed specialist (also known as lefty specialist) is a relief pitcher who throws left-handed and specializes in pitching to left-handed batters, weak right-handed batters, and switch-hitters who bat poorly right-handed. Because baseball practices permanent substitution, these pitchers frequently pitch to a very small number of batters in any given game (historically, often only one), and rarely pitch to strictly right-handed batters. Most Major League Baseball (MLB) teams have several left-handed pitchers on their rosters, at least one of whom is a left-handed specialist. A left-handed specialist is sometimes called a LOOGY (or Lefty One-Out GuY), coined by John Sickels, and may be used pejoratively.
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👉 Left-handed specialist in the context of Middle reliever
In baseball, a middle reliever, or middle relief pitcher, is a relief pitcher who typically pitches during the fifth, sixth, and seventh innings of a standard baseball game. In leagues with no designated hitter, such as in the National League before 2022 and the Japanese Central League, a middle reliever often comes in after the starting pitcher has been pulled in favor of a pinch hitter. Middle-relief pitchers are usually tasked to pitch one, two, or three innings. Several factors determine this, such as who’s winning, the score, eligible bullpen pitchers remaining, the importance of the current game, etc. After the middle relief pitcher has completed his portion, they are normally replaced in later innings by a left/right-handed specialist, setup pitcher, and/or lastly a closer. When they’re replaced, it is partly due to deprivation of stamina and/or effectiveness but also characteristics, such as pitch arsenal, speed of pitches, which arm they throw with, and who’s up to bat next for the opposing team. Middle relievers may pitch in these later innings, especially during games tied or close in score.
In this Dossier
Left-handed specialist in the context of Pitcher
In baseball, the pitcher is the player who throws ("pitches") the baseball from the pitcher's mound toward the catcher to begin each play, with the goal of retiring a batter, who attempts to either make contact with the pitched ball or draw a walk. In the defensive numbering system used in baseball, the pitcher is assigned the number 1. The pitcher is often considered the most important player on the defensive side of the game, and as such is situated at the right end of the defensive spectrum. There are many different types of pitchers, such as the starting pitcher, relief pitcher, middle reliever, lefty specialist, setup man, and the closer.
Traditionally, the pitcher also bats. Starting in 1973 with the American League and spreading to further leagues throughout the 1980s and 1990s, the hitting duties of the pitcher have generally been given over to the position of designated hitter, a cause of some controversy. The National League adopted the designated hitter in 2022; as of 2025, the Japanese Central League is the highest level of competition to not use the designated hitter position.
Left-handed specialist in the context of Relief pitcher
In baseball and softball, a relief pitcher or reliever is a pitcher who pitches in the game after the starting pitcher or another relief pitcher has been removed from the game due to fatigue, injury, ineffectiveness, ejection, high pitch count, or for other strategic reasons, such as inclement weather delays or pinch hitter substitutions. Relief pitchers are further divided informally into various roles, such as closers, setup men, middle relief pitchers, left/right-handed specialists, and long relievers. Whereas starting pitchers usually throw so many pitches in a single game that they must rest several days before pitching in another, relief pitchers are expected to be more flexible and typically pitch in more games with a shorter time period between pitching appearances but with fewer innings pitched per appearance. A team's staff of relievers is normally referred to metonymically as a team's bullpen, which refers to the area where the relievers sit during games, and where they warm-up prior to entering the game.