LOS ANGELES—Dave Roberts rushed into his office after the Dodgers’ latest victory and turned on the TV. He caught a familiar sight—the rival Giants winning again. “I was doing a little scouting,” the manager said. Mookie Betts and Corey Seager homered back-to-back in the first inning, Justin Turner and AJ Pollock did the same in the fourth, and Los Angeles completed a three-game sweep of the San Diego Padres with an 8-3 victory on Sept. 30. The defending World Series champions remained two games behind NL West-leading San Francisco, which beat Arizona 5-4 with a walk-off hit in the ninth inning. Los Angeles is chasing its ninth consecutive division title and time is running out. “This is two teams playing really good baseball in a pennant race,” Roberts said. “We just got to play good baseball. If we do that, bring it on. It doesn’t matter who we play or …