World Series appeared in 9 and won 5. As of 2018, no team has won consecutive World Series championships since the New York Yankees in , , and —the longest such drought in Major League Baseball history. Until the formation of the American Association in 1882 as a second major league, the National Association of Professional Base Ball Players (1871–1875) and then the National League (founded 1876) represented the top level of organized baseball in the United States. All championships were awarded to the team with the best record at the end of the season, without a postseason series being played. From
1903 World Series 1903 World Series The 1903 World Series was the first modern World Series to be played in Major League Baseball. It matched the American League (AL) champion Boston Americans against the National League (NL) champion Pittsburgh Pirates in a best-of-nine series, with Boston prevailing five games to three, winning the last four. Pittsburgh pitcher Sam Leever injured his shoulder while trap-shooting, so his teammate Deacon Phillippe pitched five complete games. Phillippe won three of his games, but it was not enough to overcome the club from the new American League. Boston pitchers Bill Dinneen and Cy Young led Boston to