Ed Andrieski, Associated Press
Colorado Rockies' Matt Holliday is congratulated by Willy Taveras (3) and Kazuo Matsui (7) after hitting a three-run home run during the fourth inning in Game 4 of the NLCS against the Arizona Diamondbacks in Denver, Monday.

DENVER — Riding a Rocky Mountain High like none other, Colorado is heading to its first World Series.

With their 21st win in 22 games, the relentless Rockies beat the rattled Arizona Diamondbacks 6-4 Monday night to sweep the NL championship series at a chilly Coors Field.

Matt Holliday's three-run, 452-foot shot into the pine-filled rock pile in center field capped a six-run outburst in the fourth inning, and the Rockies were on their way.

To where, they have a record eight days' rest before opening the World Series at either Cleveland or Boston on Oct. 24. The Indians lead the ALCS 2-1.

The wild-card Rockies joined the 1976 Big Red Machine as the only teams to start a postseason with seven straight wins. Colorado has won 10 in row overall and lost only once since Sept. 16.

Just one strike away from postseason elimination on the final weekend of the season, the Rockies have become a charmed team that seemingly cannot lose.

Colorado had never won more than 83 games before going 90-73 this season and sneaking into the playoffs with a 9-8, 13-inning win over San Diego in the wild-card tiebreaker. After sweeping Philadelphia in the first round of the playoffs, the Rockies put a purple pummeling on a D-backs club that led the league with 90 victories.