Lance Berkman hit a two-run homer in the eighth inning to help lift the Houston Astros to their eighth straight win with a 7-4 victory over the San Francisco Giants on Thursday. It gave Houston, which has won 16 of 20, a four-game sweep of the Giants. With the score tied in the eighth, Miguel Tejada led off with a single against reliever Keiichi Yabu (3-5).



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