The 2001 MLB postseason was uniquely shaped by the September 11 terrorist attacks, which delayed the regular season's end to October 7 and pushed the World Series to conclude on November 4—the first Fall Classic to ever finish in November. The Seattle Mariners entered with a record-setting 116 regular-season wins (their last playoff appearance until 2022) and narrowly survived a five-game ALDS scare from the Cleveland Indians. Meanwhile, the New York Yankees rallied from an 0–2 deficit to defeat the Oakland Athletics in a rematch ALDS, while the Atlanta Braves made history with their tenth consecutive postseason appearance—an MLB first. The tournament, running from October 9 to November 4, culminated in a stunning upset as the Arizona Diamondbacks beat the three-time defending champion Yankees in seven games to capture the World Series, earning Phoenix its first major professional sports championship.