The 1948 major league baseball season began on April 19, 1948. The regular season ended on October 4, with the Boston Braves and Cleveland Indians as the regular season champions of the National League and American League, respectively. The Indians won the American League title via a tie-breaker game victory over the Boston Red Sox, after both teams finished their 154-game schedules with identical 96–58 records. This was the second regular season tie-breaker, and saw a change from the previous three-game format to that of a single-game, Game 163. The postseason began with Game 1 of the 45th World Series on October 6 and ended with Game 6 on October 11. The Indians defeated the Braves, four games to two, capturing their second championship in franchise history, since their previous in 1920. Going into the season, the defending World Series champions were the New York Yankees from the 1947 season.