Rentetan Dunia adalah rentetan kejuaraan Baseball Liga Utama dan puncak sport's post-musim setiap Oktober. Karena Rentetan terjadi di mid-musim gugur, wartawan olahraga banyak tahun yang lalu menjukuki peristiwa "Klasik Turunnya". St Louis Cardinals adalah arus (2006) juara Rentetan Dunia.

Rentetan Dunia dimainkan di antara pemenang Liga Amerika dan Liga Nasional, yang sekarang ini memasukkan 30 perkumpulan yang berpangkalan di kota tertentu AS dan Kanada. Rentetan Dunia modern sudah adalah peristiwa tahunan sejak 1903, dengan kekecualian 1904 dan 1994. Baseball sudah menggunakan berbagai recipe kejuaraan sejak 1860s. Kalau "Rentetan Dunia" masa dipakai sendiri, biasanya dimengerti untuk merujuk pada Rentetan Dunia "modern secara" eksklusif".

Kejuaraan Rentetan Dunia ditentukan lewat paling--tujuh playoff. Paling--tujuh sudah adalah format seluruh Rentetan Dunia modern kecuali pada 1903, 1919, 1920 dan 1921 ketika pemenang ditentukan lewat paling--sembilan playoff. Pemenang Rentetan dihadiahi Trofi Rentetan Dunia, serta lingkaran Rentetan Dunia perseorangan.

New York Yankees sudah bermain di 39 102 Rentetan sampai dengan 2003 dan sudah mendapatkan 26 kejuaraan Rentetan Dunia, yang jauh lebih banyak daripada hak monopoli Liga Utama lain yang mana pun. St Louis Cardinals sudah memenangkan sepuluh kejuaraan, yang detik sangat sama sekali waktu dan kebanyakan bagi tim Liga Nasional yang mana pun. Kardinal juga bertahan 3 Rentetan ke 2 pinggir melawan Yankees di Rentetan bermain, satu-satunya "klasik delapan" tim Liga Nasional untuk menuntun baju kerja Yankees.

The first modern World Series was held between Boston of the American League and Pittsburgh of the National League in 1903. Boston won the series 5 games to 3, helping to establish the new league's credibility. However, the next year, the National League champion New York Giants refused to play the American League champions (Boston again) because of the alleged "inferiority" of the American League, along with the legitimate claim that there were no formal or standard rules for this championship (a factor which had helped kill the 1880s version of the Series). In response, the World Series was instituted in 1905 as a permanent institution, through which the leagues would "meet annually in a series of games for the Professional Base Ball Championship of the World.

Until 1969, teams reached the Fall Classic merely by having the best records in their respective leagues. If two teams were tied for the best record at the end of the scheduled season, the winner of a head-to-head "pennant playoff" game between the two teams was declared winner of the "pennant" (league championship), and thus represented the league in the Series.

The reorganization of each league into two divisions for the 1969 season changed the road to the Series. The winners of the East and West divisions of each league would meet in a best-of-five (later best-of-seven) League Championship Series to determine the winner of the pennant. The split into two divisions was partially based on the premise that there were too many teams in the league to have one division ("you can't sell a twelfth place team"[citation needed]). It also ensured more "pennant races" to generate more regular-season attendance, along with more post-season revenue.

A further change occurred in 1994 with the expansion of the Major Leagues and the establishment of the Central Divisions. This created an odd number of teams in each league's playoff tournament, so a fourth playoff team was added. It was called the "wildcard", patterned after the National Football League's playoff system of including the best non-divisional winner (by win-loss record) in the playoffs. This created additional regular-season races as well as further augmenting post-season income. It also had the inevitable effect of playing the game's prime event in the latter part of October, with weather often much colder and harsher than in the early part of the month, especially in the Midwest and Northeast.

Under the current format, normally the division-winner with the highest winning percentage in the league faces the wildcard in the best-of-five first round, or Division Series, and the two remaining teams face each other in the first round. However, if both the wildcard qualifier and the best divisional win-loss record come from the same division (which has happened frequently), the wildcard instead plays the division winner with the second-best record in the first round while the remaining two teams face each other. The winners of the two Division Series play in the League Championship Series for the right to play in the World Series.

In case two teams tie for the fourth playoff spot in a league, a single-game "wild-card playoff" is required to determine the final qualifier.

Although the current structure was established in 1994, the players' strike canceled the post-season events that year. Playoffs with the current structure were first played in 1995.

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