A back-breaking effort by the Astros last night yielded only a heart-breaking loss in the 13th inning. Luckily, Roy Oswalt takes the hill today in hopes of being the stopper for the umpteenth time in his career. Opposing him will be Ryan Dempster, fresh off the DL. Dempster has faced Houston more than any other opponent in his career as a starting pitcher, and has had mixed rusults in those seventeen starts.