LOS ANGELES—Gavin Lux hit his first career grand slam and Julio Urías pitched three-hit ball into the seventh inning of the Los Angeles Dodgers’ sixth victory in seven games, 9–1 over the Arizona Diamondbacks on Tuesday night. Mookie Betts hit a leadoff homer and Chris Taylor added a tiebreaking, two-run shot in the fifth inning before Lux broke it open in the seventh, putting his second homer of the season into the short right field porch off Kevin Ginkel. “Off the bat, I kind of thought it was going to be a double, but it carried a little bit,” Lux said. “I’m just getting more comfortable after coming back from the wrist injury. The more at-bats I get, my timing gets better.” Lux was a surefire prospect who took more time than expected to click in the majors, but the infielder has got it together now: He is 18 for …