Denver ? The blackout at Coors Field was caused by a cranky computer. Blame the Philadelphia Phillies’ power outage on rookie Ubaldo Jimenez and a Colorado bullpen that has been lights-out for three weeks.

The Rockies roared into the NL championship series Saturday night, completing a three-game sweep by beating Philadelphia, 2-1, on pinch-hitter Jeff Baker’s tiebreaking single in the eighth inning.

Colorado’s 17th win in 18 games was fueled by Jimenez, the hard-throwing 23-year-old who allowed one run and three hits over 61â3 innings, and a bevy of reliable relievers who silenced the Phillies’ dangerous bats for the third straight game.

The wild-card Rockies get four days off before opening the NLCS on Thursday in Arizona, the first time two teams from the NL West have met in the league championship series.

The young Diamondbacks, also a big surprise this season, finished a first-round sweep of the Chicago Cubs earlier Saturday.

This series was supposed to be a slugfest between the NL’s two highest-scoring teams – in two of the most hitter-friendly ballparks in baseball. But the Rockies put on a pitching performance that rivaled any in recent memory, shutting down Philadelphia’s sluggers time and time again.

They did it with a rotation that included ace Jeff Francis and two rookies, plus a bullpen that has become dominant over the last three incredible weeks.

With two outs in the eighth, Garrett Atkins and Brad Hawpe hit back-to-back singles off J.C. Romero to put runners at the corners. After a conference on the mound, Romero stayed in, and Baker sliced a 1-0 pitch between first baseman Ryan Howard and second baseman Chase Utley.

Manny Corpas, who has blown just one save in 22 chances since taking over as closer, pitched the ninth to close out Colorado’s first playoff series win in the franchise’s 15-year history. It was his third save in the series.

Jimenez’s only mistake was a hanging curveball that Shane Victorino sent into the right-field seats in the seventh to tie it 1-all. It was the first hit he allowed since Howard’s single in the first inning.

After Carlos Ruiz followed Victorino’s homer with a single to left, right-hander Matt Herges came in and retired the next two batters.

Things really got strange in the second inning when a computer malfunction caused the lights to go out while Victorino was up. The players retreated to their dugouts while flashbulbs freckled the stands and auxiliary lights flickered on, casting Coors Field in a dim glow.