LOS ANGELES — At 9:53 p.m. last Friday, Patrick Bailey hit a walk-off grand slam off Tanner Scott to beat the Los Angeles Dodgers at Oracle Park. The Giants crept closer in the NL Wild Card race that night, and given how ridiculous the moment was, it wasn’t hard to picture them rolling all the way through September. At 9:57 p.m. exactly a week later, Matt Chapman popped up a slider from Scott, clinching a 6-3 loss on a night that started with some promise. The Giants lost for the sixth time in seven games since the Bailey slam, and while they’re trying to avoid the math, the situation is bleak.The late July/early August Giants returned at the worst possible time. Their dreams of an unlikely postseason run could be officially extinguished as early as Sunday afternoon, and the final week might be spent simply trying to finish above .500. Even that might be a stretch, given that they’re 76-78 and have two more games left at Dodger Stadium this weekend.After the Bailey slam, manager Bob Melvin noted it has been a season of extremes. He smiled and said he hoped the Giants would ride the positive vibes as long as possible. Instead, they have found...