Braden Looper pitched around a leadoff double to Omar Vizquel in the ninth, getting three straight groundouts to finish for his 27th save.
Astros 2, Dodgers 1
At Los Angeles, Andy Pettitte (12-9) outdueled former American League East rival Derek Lowe (8-13) by allowing one run and six hits in eight innings, and Craig Biggio hit a tiebreaking home run in the eighth inning of Houston's win over Los Angeles.
Lowe allowed two runs and seven hits in eight innings as the Dodgers (57-71) dropped a season-worst 14 games under .500.
Brad Lidge got three outs for his 31st save, his 15th straight.
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