Pinch hitter Alex Dickerson lofted a sacrifice fly in the top of the 15th inning to send the San Francisco Giants past the host Boston Red Sox 7-6 Tuesday night in the opener of a three-game series. Dickerson's fly ball decided a game that featured a major-league-record-tying 24 pitchers used between the two clubs. Dereck Rodriguez (6-9) earned the win for the Giants (73-78), following a scoreless 14th by working around a walk and a single for the final three outs.