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(AP) - The San Francisco Giants sure are tough to eliminate this postseason.

Barry Zito and the Giants gave themself at least one more game in the NL championship series with a victory Friday in St. Louis to force Sunday's Game 6 back at San Francisco's AT&T Park. Just where the NL West winners want to be with their season on the line.

The Cardinals are back out West again for a trip they certainly hoped they wouldn't have to make. St. Louis leads the best-of-seven series 3-2, needing one more win to return to the World Series.

But the Cardinals know what this Giants team already did during these playoffs: winning three straight at Cincinnati in the division series after falling behind 2-0.

Ryan Vogelsong starts for the Giants against Chris Carpenter.

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