The San Francisco Giants worked their extra-inning magic on the visiting New York Mets once again Sunday afternoon, getting a walk-off, opposite-field home run from Mike Yastrzemski in the bottom of the 12th for a 3-2 victory. The win was the Giants' third in the four-game series, all in extra innings. Yastrzemski's homer, his ninth in just 48 games with the Giants, came off the sixth Mets' pitcher, Robert Gsellman (1-2), on a full-count pitch with one out.