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 last night, completing a three-game sweep by beating Philadelphia, 2-1, on pinch-hitter Jeff Baker's tiebreaking single with two outs 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 6 1/3 innings during a pitchers' duel at Coors Field, of all places. Then, those reliable Rockies relievers silenced Philadelphia's 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.

"How about that? Nobody expected the Diamondbacks and Rockies to be in the National League championship this year," Colorado rookie Troy Tulowitzki said. "But here we are."

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

In the second inning, a computer malfunction caused the lights to go out while Philadelphia's Shane 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.

The lights returned and play resumed 14 minutes later with winds gusting up to 39 mph inside the stadium, knocking down any balls hit to the outfield.

With two outs in the eighth, Garrett Atkins and Brad Hawpe hit consecutive 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 through the hole on the right side.

Manny Corpas, who has blown just one save in 22 chances since taking over as closer, pitched the ninth for his third save in the series.

Jimenez's only mistake was a hanging curveball that Victorino, a St. Anthony's alum, drove into the right-field seats in the seventh to tie it 1-all.