LOS ANGELES—On a night when the Los Angeles Dodgers honored a past Mexican-born pitching legend, an up-and-coming one was busy adding his name to history. Julio Urías earned his major league-leading 18th victory, becoming the fourth Mexican-born pitcher to record at least that many wins in a season as the Dodgers beat the Arizona Diamondbacks 5-3 on Wednesday night. “It was a really beautiful night,” Urías said through a translator. “When I started getting warmed up you could hear the mariachi playing and see the excitement around the crowd. It was very nice for me to pitch tonight.” Gavin Lux singled in the go-ahead run in the fourth and the Dodgers went on to complete a 6-0 homestand. They gained ground on San Francisco for the first time in 11 days, moving within 1 1/2 games of the NL West-leading Giants, who lost 9-6 to San Diego. Los Angeles pounded …