LOS ANGELES—The Los Angeles Dodgers need to win the week to catch NL West-leading San Francisco, and even that might not be enough. The defending World Series champions opened their final homestand of the regular season with a 2-1 victory over the San Diego Padres on Sept. 28. The Giants beat Arizona 6-4, leaving the Dodgers two games back with five to play. Los Angeles needs to win out and hope the Giants lose three in order to claim a ninth straight NL West crown. “We got to take care of our own business,” said Trea Turner, who had three hits and scored his 100th run of the season. “Close game, but all that matters is we won. It’s good to start the week with a win.” Walker Buehler tossed seven shutout innings to shake off his September slump and earn a career-best 15th victory. Buehler reached 202 2/3 innings …