<Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> 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 . 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 during the fall season in North America, it is sometimes referred to as the Fall Classic . </P> <P> 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 2017, the World Series has been contested 113 times, with the AL winning 65 and the NL winning 48 . </P> <P> The 2017 World Series took place between the Los Angeles Dodgers and Houston Astros . Seven games were played, with the Astros victorious after game seven, played in Los Angeles . The final score was 5--1 . This was the first World Series won by the Astros . </P>

Most world series wins american or national league