WEST PALM BEACH, Fla.—Ji-Yai Shin began this year thinking she’d end up playing in the LPGA Tour’s qualifying school.

A major title and a $1 million check changed that.

Shin, this summer’s British Open champion, held off Karrie Webb and an ailing Paula Creamer to win the ADT Championship on Sunday with a final round 2-under par 70 at Trump International. She captured the $1 million winner’s prize, by far the biggest on tour, after a four-birdie, two-bogey day.

“A really special year for me,” said Shin, who isn’t even a full-fledged member of the LPGA Tour ye...

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