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This article is a list of the teams that have participated in the Major League Baseball (MLB) postseason, the elimination tournament conducted after the regular season by which Major League Baseball determines its World Series champion for a given year. Major League Baseball's postseason format has evolved throughout its history, with the number of participating teams increasing from two (for its first six-plus decades) to the current 10. The World Series was first played in 1903, when the champions of the established National League (NL) and the upstart American League (AL) met for a playoff series. From that time through 1968, the two leagues (which each had eight teams through 1960) each sent only its team with the best regular-season record to the World Series. In 1969, as each league had expanded to 12 teams, each league was divided into East and West divisions and another playoff round was created. This round became known as the League Championship Series (LCS), with the four division champions competing for a spot in the World Series every year. This format lasted until 1993. In 1995, the again-expanded leagues were re-organized into three separate divisions, and another playoff round was established, called the Division Series (DS). In this format, for each league, the champions of the East, Central, and West divisions would be joined in the playoffs by a Wild Card team. The addition of the Wild Card allowed a team that was not a division winner but still had one of the top regular-season records to enter the playoffs as the number 4 seed. In 2012, the structure was adjusted such that two teams from each league receive Wild Card berths and then play a single game against each other to determine who advances to the Division Series. This is the current playoff format in Major League Baseball. Three anomalies in the above-described system occurred. In 1904, the World Series did not take place because the National League champion did not wish to participate and the leagues had not yet agreed to require their champions to do so. In 1981, there was a Division Series due to a split season brought about by a midsummer player's strike. And in 1994, the postseason did not take place due to a player's strike. ==1995–present== Note: The Brewers joined NL in 1998,the Astros joined AL in 2013. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of Major League Baseball postseason teams」の詳細全文を読む スポンサード リンク
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