PHOENIX — Willy Taveras raced toward the gap for a diving catch, then walked to first base to keep the Colorado Rockies streaking toward the World Series.

Jose Valverde walked Taveras on four pitches with the bases loaded in the top of the 11th inning, and Colorado beat the Arizona Diamondbacks, 3-2, last night for a 2-0 lead in the NL Championship Series.

After their 19th victory in 20 games, the seemingly unstoppable Rockies headed home to Denver, where the series resumes tomorrow night with Josh Fogg pitching against Arizona's Livan Hernandez.

Two wins at Coors Field would give Colorado the first pennant of its 15-season history.

"We're fundamentally sound, we pitch better, we find ways to win," Rockies manager Clint Hurdle said. "That has played out very well. We've got nine straight road wins, four in the postseason, that speaks for itself."

The Rockies recovered after blowing a ninth-inning lead with help from Taveras, playing his second game since missing 24 with a leg injury.

Leading off the 11th, pinch-hitter Ryan Spilborghs reached on an infield single. Brad Hawpe walked with one out and Jamey Carroll walked with two outs against Valverde, pitching more than an inning for just the second time this season.

Valverde, appearing to grow tired, couldn't find the plate against Taveras, either.

"Until he gives up a run, it's his game," Diamondbacks manager Bob Melvin said.

The Diamondbacks tried almost everything to come back, sending sweet-swinging pitcher Micah Owings to the plate as a pinch-hitter in the 11th.

Owings had 12 hits in his prior 21 at-bats, with three homers and 10 RBIs. But he flied to center for the second out and Ryan Speier fanned Chris Young to complete a perfect inning for his first major league save. The game lasted 4 hours, 26 minutes.

"We've come back from some difficult circumstances this year," Melvin said. "It's two games. A team has to win four before it's over."

Colorado was ahead 2-1 in the ninth when closer Manny Corpas hit Young on a 1-2 pitch with one out, then Young took third on Stephen Drew's single to center.

Eric Byrnes hit a bouncer to second baseman Kaz Matsui. With no chance to get the speedy Young at home, Matsui tried for a double play.

His backhand flip to second was high for an error, and shortstop Troy Tulowitzki came off the bag to grab it.

Drew, however, didn't realize he was called safe by umpire Tom Hallion and wandered off second base. Tulowitzki, who had started to argue, soon noticed. He ran toward Drew and threw to third baseman Carroll, who applied the tag.

It was a costly mistake by Drew, in his first full season in the majors. Tony Clark grounded to Tulowitzki, ending the inning.

It was Corpas' second blown save since becoming Colorado's closer in midseason. He saved all three victories in the division series sweep of Philadelphia.

Left off the first-round playoff roster because of a leg injury, the speedy Taveras put the Rockies ahead 2-1 in the fifth when he scored on Todd Helton's sacrifice fly.

With the Rockies clinging to that one-run lead in the seventh, Taveras' speed was a huge factor again. The Diamondbacks had a runner on first with two outs when Clark hit a drive to right-center off LaTroy Hawkins.

Taveras raced into the gap and laid out with a fully extended dive to make an outstanding grab.