The World Series is the annual championship series of Major League Baseball (MLB) in North America, contested since 1903 between the American League (AL) champion team and the National League (NL) champion team. Prior to 1969, the team with the best regular season win-loss record in each league automatically advanced to the World Series; since then each league has conducted a championship series (ALCS and NLCS) preceding the World Series to determine which teams will advance. As of 2015, the World Series has been contested 111 times, with the AL winning 64 and the NL winning 47. The winner of the World Series championship is determined through a best-of-seven playoff, and the winning team is awarded the Commissioner's Trophy. As the series is played in October (and occasionally November), during the autumn season in North America, it is often referred to as the Fall Classic.
The 2015 World Series took place between the New York Mets and the victorious Kansas City Royals. Five games were played, with the Royals victorious after game five, played in New York. The final score was 7-2; the game went into extra innings after a tied score of 2-2. This was the second World Series won by the franchise and the first in 30 years.
In the American League, the New York Yankees have played in 40 World Series and won 27, the Philadelphia/Kansas City/Oakland Athletics have played in 14 and won 9, and the Boston Red Sox have played in 12 and won 8, including the first World Series. In the National League, the St. Louis Cardinals have appeared in 19 and won 11, the New York/San Francisco Giants have played in 20 and won 8, the Brooklyn/Los Angeles Dodgers have appeared in 18 and won 6, and the Cincinnati Reds have appeared in 9 and won 5.
As of 2015, no team has won consecutive World Series championships since the New York Yankees in 1999 and 2000, the longest such duration in Major League Baseball history.