Posey drives in 2 to back Cain, Giants top Astros

AP - Sports
Posey drives in 2 to back Cain, Giants top Astros
San Francisco Giants' Buster Posey hits an RBI single off Houston Astros starting pitcher Bud Norris during the fifth inning of their baseball game, Sunday, July 15, 2012, in San Francisco. (AP Photo/Eric Risberg)
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