Morikawa went into the final round two shots off the lead, then finished at 13 under, two shots ahead of the runners-up, Casey and Dustin Johnson. He now has three victories over all in his brief time on the PGA Tour.
“It’s amazing,” Morikawa said after receiving the trophy on the 18th green.
“To close it out in San Francisco,” he added, “which is pretty much my second home, where I spent the last four years, is pretty special.”
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Morikawa broke out of a tangled pack on the back nine, which at one point featured a seven-way tie at 10 under.
The mass of contenders included a blend of veterans like Casey, 43, and Johnson, 36, and a blast of the sport’s new wave. Matthew Wolff, 21, posted a 65 in the final round, and Scottie Scheffler, 24, was in the hunt until the end. They finished tied for fourth.
Surprisingly, the two-time defending champion, Brooks Koepka, who made confident proclamations on Saturday night, tumbled off the leader board with a four-over 74 Sunday.
It was Morikawa’s time.
First, though, there was adversity.
His approach on the par-4 No. 14, from the fairway, came up a disappointing 15 yards short. It was then that Morikawa displayed the sang-froid and the soft hands that have characterized the brilliant start to his career.
He coolly lofted a clean chip from the fairway that rolled into the cup for a birdie.
A nearby pack of volunteers cheered, apparently feeling obliged to punctuate the silence for such a moment.