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Bullpen is used in two related senses:

  1. An area, either on the field of play or separated from it by a fence, where relief pitchers hang out and warm up before entering the game. "The manager is signalling to the bullpen to call for his closer."
  2. A collective term for all of a team's relief pitchers. "The 2002 Angels had a very strong bullpen."

The creation of the bullpen as a separate entity within a pitching staff is a relatively recent one. Until the end of the 1940s, teams may not have carried more than one or two specialized relievers, with starters on their off-day and swingmen doing most of the work when a starting pitcher had to leave a game early. The constitution of a more formal bullpen began in the 1950s and in that decade and in the 1960s, teams usually carried only four relievers, with one or two "relief aces" getting the bulk of the work. A five-man bullpen became the standard in the 1970s and 1980s, but this number has crept up inexorably since the start of the 1990s, and by the mid-2010s, some teams were using eight relievers in addition to a five-man starting rotation. That meant that rosters now included 13 pitchers, and 8 starting position players, leaving a mere four slots for other back-ups - three for American league teams who had to use a designated hitter on a daily basis. Ironically, this was bringing baseball back to its early days, when position players were almost never substituted, except in case of injury, and utility players able to play a number of positions becoming more valuable than they had ever been.

[edit] Further Reading

  • Anthony Castrovince: "Eight-man bullpens gaining traction",, February 25, 2015. [1]
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