Pirates ride Karstens to 2-0 win over Astros

AP - Sports
Pirates ride Karstens to 2-0 win over Astros
Pittsburgh Pirates' Neil Walker, left, dives back safely to first as the pick-off throw from Houston Astros pitcher Bud Norris gets past first baseman Chris Johnson (23) during the first inning of a baseball game in Pittsburgh on Thursday, July 5, 2012. (AP Photo/Gene J. Puskar)
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