It's time for the Giants to step up their game, and they know it.

No more bobbles on the infield. No more long, hopeless sprints for their lumbering outfielders. No more charity.

The Giants traveled to Denver after a 6-5, 12-inning loss to the Arizona Diamondbacks on Sunday afternoon, hoping to cling to a Colorado Rockies club that has a 12-3 record, a four-game lead in the National League West and a freight train of momentum.

"We know they're playing well," Giants manager Bruce Bochy said. "And we're not playing our best ball. We're still making mistakes, but we're winning series, and that's what's important."

They can't hope for the same result if they give extra outs to the Rockies. So it is important that the Giants eliminate mistakes such as the dropped throw by shortstop Miguel Tejada that led to Arizona's tying run in the eighth inning.

The Diamondbacks won it when a tiring Dan Runzler issued two walks in the 12th and Stephen Drew singled through the right side against Javier Lopez.

But the real lapse came four innings earlier when Tejada tried to tag Xavier Nady before the ball arrived from catcher Buster Posey on a two-out steal attempt. (Nady was credited with a stolen base). Jeremy Affeldt gave up two well-placed ground-ball singles as Arizona tied the score.