Jose Valverde walked Taveras on four pitches with the bases loaded in the 11th inning, and Colorado beat the Arizona Diamondbacks 3-2 tonight 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 Sunday 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.

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.

The Diamondbacks tried almost everything to come back, sending 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 out for the second out, and Ryan Speier struck out Chris Young to complete a perfect inning for his first major league save in a game that lasted 4 hours, 26 minutes.

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 an improbable double play.

His backhand flip to second was high for an error, and slick-fielding 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 Jamey 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. The first was Sept. 21 at San Diego. 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.

Taveras drew a leadoff walk on four pitches from Doug Davis, advanced on Matsui's single and raced to third on Matt Holliday's fly to left field, barely beating Byrnes' throw.

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.

The Rockies won their previous seven games wearing black jerseys, but they had to settle for gray with pinstripes in this one. The Diamondbacks broke out the black, something they had reserved for home Saturday night games in the regular season.

The styles of the starting pitchers could hardly have been more different. Colorado rookie Ubaldo Jimenez regularly hit 99 mph on the Chase Field radar gun. Davis uses a stop-and-go motion and an array of breaking pitches.

Davis, who had four hits in 58 at-bats all season, doubled leading off the third for his first extra-base hit since 2005. He scored when Young singled up the middle on a 98 mph pitch to tie it at 1.

After Mark Reynolds' error on Helton's grounder to third in the second inning, Davis struck out consecutive batters before Brad Hawpe singled and Yorvit Torrealba hit a bloop single that put the Rockies in front.

In yet another demonstration of the way things are going for Colorado, Torrealba's opposite-field hit landed on the right-field line.

Missed opportunities abounded for Arizona.