LOS ANGELES — Yasmani Grandal hit a three-run homer, Corey Seager added two more home runs, and the Los Angeles Dodgers beat the Atlanta Braves 12-6 Sunday to complete a three-game sweep with their seventh win in a row at home. Seager went 3 for 5, drove in four runs and scored twice two days after hitting three homers in Friday’s 4-2 win in the series opener. The 22-year-old rookie shortstop edged ahead of Adrian Gonzalez (.284) as the team’s top hitter with a .286 average.