The 2007 National League Championship Series (NLCS), the final round of the 2007 National League playoffs, began on October 11 and ended on October 15. It was a best-of-seven series, with the West Division champion Arizona Diamondbacks facing the wild card Colorado Rockies, also from the West Division. The Rockies swept the series in four games to win their first ever pennant, extending a 17–1 run to 21–1 in the process. The Rockies won the opportunity to play the American League champion Boston Red Sox in the 2007 World Series. Colorado's NLCS sweep was only the second NLCS sweep since the seven-game format was adopted in 1985, with the first being the Atlanta Braves' sweep in 1995.