This isn't torture, this is agony. But somehow, the Giants are managing to find a way tostay alive despite a seriously vapor-locked offensive attack. Jeff Keppinger's two-out single in the bottom of 10th inningafter pinch-hitter Mark DeRosa had singled and stolen second basewith one out allowed the Giants to squeeze out their secondstraight 2-1 victory over Houston on Saturday night at AT&TPark. It ended what was mostly a night of offensive frustration on apositive note for the Giants , who managed just five hits,including a mere two over the first seven innings against Astrosstarter Brett Myers.