The first official World Series was contested in 1903 between the Boston Americans (now the Boston Red Sox) and the Pittsburgh Pirates (now the Pittsburgh Pirates).

Boston upset Pittsburgh five games to three. Yes, you read that it was an eight-game series.
The American League has won 65 of those 114 World Series championships. The Yankees lead the charge with 27 titles in only 40 looks — something Yankees fans won’t let you forget… EVER.
The revealing in the American League is the Oakland Athletics, who have won eight of the 14 appearances. A few of those looks came when they had been the Philadelphia Athletics and not one came when the group was based in Kansas City. The Red Sox have won eight of their 12 appearances and like the Yankees, their fans will not let you forget it.
In the National League, St. Louis is in the lead with 11 wins in its own 19 appearances, followed by the San Francisco Giants — formerly the New York Giants of the”Shot heard’round the world!” Fame — winning eight of their 20 appearances. The LA Dodgers have won half of the 18 appearances with a few of those wins occurring when the group was based in Brooklyn.
There are two groups which have to play in a World Series — the Seattle Mariners and the Washington Nationals. Some of us are OK with this since the Montreal Expos never left it to the World Series and now it’s DC’s turn to endure.
A group has not won consecutive World Series since the Yankees took the championship in 1998, 1999 and 2000. Bear in mind the that are core? Only one of them was recorded in the Mitchell Report. Would you guess which one? Here is a hint: It is not Mariano Rivera because he was too busy being a good person.

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