* Giants to play either St. Louis or Washington in NLCS * Reds season over after first three-game home skid of 2012 (Adds byline, quotes and details) Oct 11 - Buster Posey powered the San Francisco Giants to a 6-4 victory and an unlikely series comeback over the Cincinnati Reds on Thursday to book a spot in the National League Championship Series for the second time in three seasons. A scoreless game was blown open when Posey capped a six-run fifth inning for the Giants with a grand slam that ended Reds starting pitcher Mat Latos's outing and silenced the home crowd. ...