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PHOENIX — Shohei Ohtani matched his career high with his 54th home run, Freddie Freeman went deep twice and the Los Angeles Dodgers clinched their 12th National League West title in 13 years by beating the Arizona Diamondbacks 8-0 on Thursday.

Ohtani’s home run splashed into the Chase Field swimming pool behind the right-center wall for a 6-0 lead in the fourth inning. The two-run shot gave him 101 RBIs and matched his career-best home run total with the World Series champion Dodgers last year. He has scored a big-league-high 144 runs.

The Dodgers, who clinched a postseason berth last week, won their fourth straight division title.

The Diamondbacks (80-79) fell 1¾ games behind the New York Mets (81-77) for the final NL wild-card spot and also are one game back of the Cincinnati Reds (81-78). The Diamondbacks close with three games against the Padres in San Diego.

Yoshinobu Yamamoto (12-8) allowed four hits in six innings and struck out seven to finish with 201. His 2.49 ERA ranked second in the NL behind the 1.97 ERA of the Pittsburgh Pirates’ Paul Skenes.

Three relievers finished a five-hitter in the Dodgers’ 10th shutout.

Freeman and Andy Pages homered back to back starting the second inning, Freeman off opener Jalen Beeks (5-3) and Pages against Nabil Crismatt. Mookie Betts added a two-run single.

Freeman, who had three RBIs, has 23 home runs while Pages has 27.

The Diamondbacks finished 43-38 at Chase Field. The crowd of 34,952 raised home attendance to 2,393,773, the team’s highest since 2008.

The Dodgers were 36-16 against the NL West.